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.
Atenció: Aquestes cites poden no estar 100% correctes.