Cita APA (7th ed.)

De Cresce, R. P. (1989). Drug testing in the workplace. ASCP Press, American Society of Pathologists.

Cita Chicago (17th ed.)

De Cresce, Robert P. Drug Testing in the Workplace. Chicago: ASCP Press, American Society of Pathologists, 1989.

Cita MLA (9th ed.)

De Cresce, Robert P. Drug Testing in the Workplace. ASCP Press, American Society of Pathologists, 1989.