Cita APA (7a ed.)

Sorensen, M. F. (1978). Observations of Mallards in the Parkland of Alberta. Canadian widlife service.

Cita Chicago Style (17a ed.)

Sorensen, Michael F. Observations of Mallards in the Parkland of Alberta. Ottawa: Canadian widlife service, 1978.

Cita MLA (8a ed.)

Sorensen, Michael F. Observations of Mallards in the Parkland of Alberta. Canadian widlife service, 1978.