Gaya APA

Levin, M, R., Alan, I, S. (NULL). Educational Investment in an Urban Society Cost, Benefits, and Public ì Policy . New: New York: Theachers College Press; 1970.

Gaya MLA

Levin, Melvin, R., Alan, I., Shank,. "Educational Investment in an Urban Society Cost, Benefits, and Public ì Policy". New: New York: Theachers College Press; 1970, NULL. Text.