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