Cita APA (7a ed.)

Spergel, I. A., Oh, S., Curry, J., Rodriguez, P., Hamanda, P., Caldero, R., . . . Curry, G. (1990). Survey of Youth Gang Problems and Programs in 45 Cities and 6 Sites. [Verlag nicht ermittelbar].

Cita Chicago Style (17a ed.)

Spergel, Irving A., et al. Survey of Youth Gang Problems and Programs in 45 Cities and 6 Sites. [Erscheinungsort nicht ermittelbar]: [Verlag nicht ermittelbar], 1990.

Cita MLA (9a ed.)

Spergel, Irving A., et al. Survey of Youth Gang Problems and Programs in 45 Cities and 6 Sites. [Verlag nicht ermittelbar], 1990.