Gaya APA
Fraenkel, J, R. (1980).
Helping students think and value strategies for teaching the social studies .
Englewood Cliffs:
Prentice-Hall.
Gaya MLA
Fraenkel, Jack, R..
"Helping students think and value strategies for teaching the social studies".
Englewood Cliffs:
Prentice-Hall,
1980.
Text.