APA Style
Spyri, Johanna. (2012).
Heidi .
London:
Vintage.
Chicago Style
Spyri, Johanna.
Heidi.
London:
Vintage,
2012.
Text.
MLA Style
Spyri, Johanna.
Heidi.
London:
Vintage,
2012.
Text.
Turabian Style
Spyri, Johanna.
Heidi.
London:
Vintage,
2012.
Print.