Cita APA (7a ed.)

Ostrom, E., Parks, R. B., & Whitaker, G. P. (1977). Policing - is there a system: Abstract. Indiana Univ.

Cita Chicago Style (17a ed.)

Ostrom, Elinor, Roger B. Parks, y Gordon P. Whitaker. Policing - Is There a System: Abstract. Bloomington: Indiana Univ, 1977.

Cita MLA (8a ed.)

Ostrom, Elinor, et al. Policing - Is There a System: Abstract. Indiana Univ, 1977.