APA Style
Spyri, Johanna. (2013).
Heidi .
London:
Ladybird.
Chicago Style
Spyri, Johanna.
Heidi.
London:
Ladybird,
2013.
Text.
MLA Style
Spyri, Johanna.
Heidi.
London:
Ladybird,
2013.
Text.
Turabian Style
Spyri, Johanna.
Heidi.
London:
Ladybird,
2013.
Print.