Gaya APA

Welton, D, A., Mallan, J, T. (1981). Children and their world : strategis for teaching social studies (2nd ed.). Boston: Hpugton Mifflin Co..

Gaya MLA

Welton, David, A.., Mallan, Jhon, T.. "Children and their world : strategis for teaching social studies". 2nd ed. Boston: Hpugton Mifflin Co., 1981. Text.