Cita APA (7th ed.)

Lee, R. M. (2000). Unobtrusive methods in social research. Open University Press.

Cita Chicago (17th ed.)

Lee, Raymond M. Unobtrusive Methods in Social Research. Buckingham [England]: Open University Press, 2000.

Cita MLA (9th ed.)

Lee, Raymond M. Unobtrusive Methods in Social Research. Open University Press, 2000.