Cita APA (7th ed.)

Amberber, M., & Collins, P. (2002). Language universals and variation. Praeger.

Cita Chicago (17th ed.)

Amberber, Mengistu, i Peter Collins. Language Universals and Variation. Westport, Conn: Praeger, 2002.

Cita MLA (9th ed.)

Amberber, Mengistu, i Peter Collins. Language Universals and Variation. Praeger, 2002.