Cita APA (7th ed.)
GERSTEIN, D., & HARWOOD, H. (1992). TWO TIERS: PUBLIC AND PRIVATE SUPPLY. EN: TREATING DRUG PROBLEMS, VOL. 1. NATIONAL ACADEMY PRESS.
Cita Chicago (17th ed.)
GERSTEIN, D.R, i H.J HARWOOD. TWO TIERS: PUBLIC AND PRIVATE SUPPLY. EN: TREATING DRUG PROBLEMS, VOL. 1. WASHINGTON (USA): NATIONAL ACADEMY PRESS, 1992.
Cita MLA (9th ed.)
GERSTEIN, D.R, i H.J HARWOOD. TWO TIERS: PUBLIC AND PRIVATE SUPPLY. EN: TREATING DRUG PROBLEMS, VOL. 1. NATIONAL ACADEMY PRESS, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.