Cita APA (7a ed.)

Singer, S., & O`Donnovan, N. (1993). Urban USA: Life in three American cities (Teacher's book, 1. Aufl., 1. Dr.). Klett.

Cita Chicago Style (17a ed.)

Singer, Siegfried, y Noreen O`Donnovan. Urban USA: Life in Three American Cities. Teacher's book, 1. Aufl., 1. Dr. Stuttgart [u.a.]: Klett, 1993.

Cita MLA (9a ed.)

Singer, Siegfried, y Noreen O`Donnovan. Urban USA: Life in Three American Cities. Teacher's book, 1. Aufl., 1. Dr. Klett, 1993.