Gaya APA

Fraenkel, J, R. (1980). Helping students think and value strategies for teaching the social studies (2nd ed). Englewood Cliffs, NJ: Prentice Hall.

Gaya MLA

Fraenkel, Jack, R.. "Helping students think and value strategies for teaching the social studies". 2nd ed Englewood Cliffs, NJ: Prentice Hall, 1980. Text.