Cita APA (7a ed.)

Coombs, R. H. (1991). Drug testing: Issues and options. Oxford Univ. Press.

Cita Chicago Style (17a ed.)

Coombs, Robert H. Drug Testing: Issues and Options. New York [u.a.]: Oxford Univ. Press, 1991.

Cita MLA (8a ed.)

Coombs, Robert H. Drug Testing: Issues and Options. Oxford Univ. Press, 1991.