400 Language
401 Philosophy & theory
402 Miscellany
403 Dictionaries & encyclopedias
404 Special topics
405 Serial publications
406 Organizations & management
407 Education, research, related topics
408 With respect to kinds of persons
409 Geographical & persons treatment
410 Linguistics
411 Writing systems
412 Etymology
413 Dictionaries
414 Phonology
415 Structural systems (Grammar)
416 Not assigned or no longer used
417 Dialectology & historical linguistics
418 Standard usage Applied linguistics
419 Verbal language not spoken or written
420 English & Old English
421 English writing system & phonology
422 English etymology
423 English dictionaries
424 Not assigned or no longer used
425 English grammar
426 Not assigned or no longer used
427 English language variations
428 Standard English usage
429 Old English (Anglo-Saxon)
430 Germanic languages German
431 German writing system & phonology
432 German etymology
433 German dictionaries
434 Not assigned or no longer used
435 German grammar
436 Not assigned or no longer used
437 German language variations
438 Standard German usage
439 Other Germanic languages
440 Romance languages French
441 French writing system & phonology
442 French etymology
443 French dictionaries
444 Not assigned or no longer used
445 French grammar
446 Not assigned or no longer used
447 French language variations
448 Standard French usage
449 Provencal & Catalan
450 Italian, Romanian, Rhaeto-Romantic
451 Italian writing system & phonology
452 Italian etymology
453 Italian dictionaries
454 Not assigned or no longer used
455 Italian grammar
456 Not assigned or no longer used
457 Italian language variations
458 Standard Italian usage
459 Romanian & Rhaeto-Romanic
460 Spanish & Portuguese languages
461 Spanish writing system & phonology
462 Spanish etymology
463 Spanish dictionaries
464 Not assigned or no longer used
465 Spanish grammar
466 Not assigned or no longer used
467 Spanish language variations
468 Standard Spanish usage
469 Portuguese
470 Italic Latin
471 Classical Latin writing & phonology
472 Classical Latin etymology & phonology
473 Classical Latin dictionaries
474 Not assigned or no longer used
475 Classical Latin grammar
476 Not assigned or no longer used
477 Old, Postclassical, Vulgar Latin
478 Classical Latin usage
479 Other Italic languages
480 Hellenic languages Classical Greek
481 Classical Greek writing & phonology
482 Classical Greek etymology
483 Classical Greek dictionaries
484 Not assigned or no longer used
485 Classical Greek grammar
486 Not assigned or no longer used
487 Preclassical & postclassical Greek
488 Classical Greek usage
489 Other Hellenic languages
490 Other languages
491 East Indo-European & Celtic languages
492 Afro-Asiatic languages Semitic
493 Non-Semitic Afro-Asiatic languages
494 Ural-Altaic, Paleosiberian, Dravidian
495 Languages of East & Southeast Asia
496 African languages
497 North American native languages
498 South American native languages
499 Miscellaneous languages
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Third Edition
Susan M. Gass and Larry Selinker, 2008
Introducing Second Language Acquisition
MURIEL SAVILLE-TROIKE, 2006
Second Language Acquisition and Second Language Learning
Stephen D Krashen, 1981
Principles and Practice in Second Language Acquisition
Stephen D Krashen, 1982
Understanding Second language acquisition
Lourdes Ortega, 2009
The Cambridge Handbook of Second Language Acquisition
Edited by Julia Herschensohn Martha Young-Scholten, 2013
THE ELEMENTS OF STYLE
Oliver Strunk, 2000
Philosophy of Language
ZOLTÁN GENDLER SZABÓ and R ICHMOND H. THOMASON, 2019
BEGINNING JAPANESE FOR PROFESSIONALS: BOOK 1
Emiko Konomi, 2015
LEARN FRENCH WITH PAUL NOBLE
Paul Noble, 2010
L e a r n To R e a d
Gr eek Pa rt 1
Andrew Keller
Stephanie Russell, 2012
The English Language From Sound to Sense
Gerald P. Delahunty James J. Garvey, 2010
POLYGLOT H OW I L EAR N LA N G U A G E S
KATÓ LOMB, 2008