Citazione Stile APA (7a Edizione)

Collinwood, G. E., & Hazen, F. (1977). Ideas for Learning Centers. Third and Fourth Grade.

Citazione stile Chigago Style (17a edizione)

Collinwood, Gerry E., e Frances Hazen. Ideas for Learning Centers. Third and Fourth Grade. 1977.

Citatione MLA (9a ed.)

Collinwood, Gerry E., e Frances Hazen. Ideas for Learning Centers. Third and Fourth Grade. 1977.