APA (7e ed.) Bronvermelding

Ziefert, H., & Plecas, J. (2000). Grandpas are for finding worms. Puffin Books.

Chicago (17e ed.) Bronvermelding

Ziefert, Harriet, en Jennifer Plecas. Grandpas Are for Finding Worms. New York, NY: Puffin Books, 2000.

MLA (8e ed.) Bronvermelding

Ziefert, Harriet, en Jennifer Plecas. Grandpas Are for Finding Worms. Puffin Books, 2000.