APA Style
Spyri, Johanna. (2003).
Heidi .
United Kingdom:
Puffin Books.
Chicago Style
Spyri, Johanna.
Heidi.
United Kingdom:
Puffin Books,
2003.
.
MLA Style
Spyri, Johanna.
Heidi.
United Kingdom:
Puffin Books,
2003.
.
Turabian Style
Spyri, Johanna.
Heidi.
United Kingdom:
Puffin Books,
2003.
.