Cita APA (7a ed.)

Hamer, J. (1987). Echocardiography. Boehringer Ingelheim.

Cita Chicago Style (17a ed.)

Hamer, J.P.M. Echocardiography. Utrecht: Boehringer Ingelheim, 1987.

Cita MLA (9a ed.)

Hamer, J.P.M. Echocardiography. Boehringer Ingelheim, 1987.