Cita APA (7a ed.)

Amir, Y. (1969). Contact hypothesis in ethnic relations. [s.n.].

Cita Chicago Style (17a ed.)

Amir, Yehuda. Contact Hypothesis in Ethnic Relations. [S.l.]: [s.n.], 1969.

Cita MLA (9a ed.)

Amir, Yehuda. Contact Hypothesis in Ethnic Relations. [s.n.], 1969.