Cita APA (7th ed.)
HARRELL, A., & PETERSON, G. (1992). DRUGS, CRIME, AND SOCIAL ISOLATION. BARRIERS TO URBAN OPPORTUNITY. URBAN INSTITUTE PRESS.
Cita Chicago (17th ed.)
HARRELL, A.V, i G.E PETERSON. DRUGS, CRIME, AND SOCIAL ISOLATION. BARRIERS TO URBAN OPPORTUNITY. WASHINGTON,DC (USA): URBAN INSTITUTE PRESS, 1992.
Cita MLA (9th ed.)
HARRELL, A.V, i G.E PETERSON. DRUGS, CRIME, AND SOCIAL ISOLATION. BARRIERS TO URBAN OPPORTUNITY. URBAN INSTITUTE PRESS, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.