Cita APA (7th ed.)

Preston, P. W. (1982). Theories of development. Routledge & Kegan Paul.

Cita Chicago (17th ed.)

Preston, P. W. Theories of Development. London: Routledge & Kegan Paul, 1982.

Cita MLA (9th ed.)

Preston, P. W. Theories of Development. Routledge & Kegan Paul, 1982.