Key point
There are varying rules for presenting titles of items like books, movies, software programs, webpages and so on in body copy.
Use title case (caps on the first letter of each word) and roman font for the names of:
websites
social media apps like Facebook, Instagram and so on
video games
apps.
Use sentence case and italics for book titles:
Body: My first chunky board book
Choo choo clickety-clack
Dear zoo
The complete autism handbook
For children's books, refer only to the author (not the illustrator) in article body - for example, Ten little fingers and ten little toes by Mem Fox.
Use title case and italics for the names of:
TV series
movies.
Use sentence case (cap on first letter only) for song titles inside single quote marks:
'If you're happy and you know it'
'Twinkle, twinkle, little star'
'Heads and shoulders, knees and toes'