APA Style
Spyri, Johanna,. (1994).
Heidi .
London:
Ladybird.
Chicago Style
Spyri, Johanna,.
Heidi.
London:
Ladybird,
1994.
Text.
MLA Style
Spyri, Johanna,.
Heidi.
London:
Ladybird,
1994.
Text.
Turabian Style
Spyri, Johanna,.
Heidi.
London:
Ladybird,
1994.
Print.