Google Search Results
A Google Scholar search of reveals citations of PLTL:  (to open use this link: right click mouse over "peer-led team learning"  and open in new tab).

Key References for Peer-led Team Learning 

1.  Peer-led Team Learning: A Guidebook.  (2001) David K. Gosser, Jr., Mark S, Cracolice, J.A. Kampmeier, Victor Strozak, and Pratibha Varma-Nelson Prentice-Hall. Upper Saddle River, NJ.   The primary reference for Peer-led Team Learning. This is the first comprehensive description of PLTL from the founders of the PLTL model. 

2.   Workshop Chemistry: Overcoming the Barriers to Success. (1996). The Chemical Educator. 1(1).   A an early snapshot of the development, when PLTL was know as workshop chemistry. 

3.  Peer-led Team Learning: James Flack Norris Award Address. (2010) David K. Gosser, Jr., Jack A. Kampmeier, and Pratibha Varma-Nelson. Journal of Chemical Education.  87 (4)
    A definitive look at the origins, development, and dissemination of PLTL. 

4.  The PLTL Boost: A Critical Review of Research. David K. Gosser, Jr.  Progressions, Vol 14 (1) Summer 2011
     A meta-study of published research on PLTL. 

5.  Peer-led Team Learning: Scientific Learning and Discovery. (2009) David K. Gosser, Jr. in the Chemists' Guide to Effective Teaching (Peinta, Greenbowe, Cooper, eds). Prentice Hall, Saddle River, NJ.  

6.  Peer-led Team Learning: Organic Chemistry. Jack A. Kampmeier and Pratibha Varma-Nelson. in the Chemists' Guide to Effective Teaching (Peinta, Greenbowe, Cooper, eds). Prentice Hall, Saddle River, NJ.  

7.  Implementation of a Peer-led Team Learning Instructional Approach in an Undergraduate Organic Chemistry Course. (2002) L. Tien, V. Roth, and J. Kampmeier. J. Res. Sci. Teach. 39 pt. 606-632 2002. 

8.  Retention and Reform: An Evaluation of Peer-led Team Learning. (2011)  Scott E. Lewis, Journal of Chemical Education 88. PG 703-707. 

9.  Departing from Lecture: A Peer-led Guided Inquiry Alternative. (2005)  Scott Lewis and Jennifer Lewis. Journal of Chemical Education 82 pg 135-139. 

10.  Peer-led Team Leaning and Improved Performance in an Allied Health Chemistry Course. (2010Ayoni Akinyele. Chem. Ed. 15 353-360. 

11.  Peer-led Team Learning in General Chemistry: Implementation and Evaluation. (2008) Susan Hockings, Karen DeAngelis, and Regina Frey. Journal of Chemical Education. 85. pg. 990-996. 

12.  Effectiveness of Facilitatiing Small-Group Learing in Large Lecture Classes: A General Chemistry Case Study. (2008)  D. Lyon and J. Lagowski. Journal of Chemical Education 85 pg 1571-1576.

13. Peer-led Team Learning in Organic Chemistry: Effects on Student Performance, Success, and Persistence in the Course. (2006)  Carl Wamser. Journal of Chemical Education.  83 pg. 1562-1566. 

14. What Teaching Teaches: Performance Gains of Mentors. (2009)  Katie Amaral and Martin Vala. Journal of Chemical Education 86 pg. 630-633. 

15. Replacing Lecture with Peer-led Workshops Improves Student Learning. (2009)   Ralph Preszler,  CBE -Life Sciences Education. pgs. 182-192

16.  Peer-led Team Learning: Evaluation, Dissemination, and Institutionalization of a College Level Initiative. (2008)  Leo Gafney and Pratibha Varma-Nelson.  Springer

17.  Replicating Peer-led Team Learning in Cyberspace.  Smith, Wilson, Banks, Zhu and Varma-Nelson. Journal of Research in Science Teaching. Vol. 51, pg. 714

18.  Chemistry: Exploring the Molecular Vision.   David Gosser.  2011 Linus Publications. 

19. Peer-led Team Learning: Origins, Research, and Practice. David Gosser. 2015 Linus Publications

David Gosser,
Sep 23, 2014, 2:49 PM