Gaya APA

Widmer, E, L. (1974). The Critical Years: Early Childhood Education at the Crossroads (Cet. 1.--). Vancouver: Copp Clark.

Gaya MLA

Widmer, Emmy, Louise. "The Critical Years: Early Childhood Education at the Crossroads". Cet. 1.-- Vancouver: Copp Clark, 1974. Text.