Cita APA (7a ed.)

Keith-Lucas, A. (1972). Giving and taking help. University of North Carolina.

Cita Chicago Style (17a ed.)

Keith-Lucas, Alan. Giving and Taking Help. Chapel hill: University of North Carolina, 1972.

Cita MLA (9a ed.)

Keith-Lucas, Alan. Giving and Taking Help. University of North Carolina, 1972.