Cita APA (7a ed.)

Kagan, J., & Klein, R. E. (1973). Cross-cultural perspectives on early development. [s.n.].

Cita Chicago Style (17a ed.)

Kagan, Jerome, y Robert E. Klein. Cross-cultural Perspectives on Early Development. [S.l.]: [s.n.], 1973.

Cita MLA (9a ed.)

Kagan, Jerome, y Robert E. Klein. Cross-cultural Perspectives on Early Development. [s.n.], 1973.