APA Style
Spyri, Johanna. (0).
Heidi .
London:
Puffin Books.
Chicago Style
Spyri, Johanna.
Heidi.
London:
Puffin Books,
0.
Book.
MLA Style
Spyri, Johanna.
Heidi.
London:
Puffin Books,
0.
Book.
Turabian Style
Spyri, Johanna.
Heidi.
London:
Puffin Books,
0.
Book.