Παραπομπή APA

Gappert, G., & Knight, R. V. (1982). Cities in the 21st century. Beverly Hills: Sage Publications.

Παραπομπή Chicago Style

Gappert, Gary, and Richard V. Knight. Cities in the 21st Century. Beverly Hills: Sage Publications, 1982.

Παραπομπή MLA

Gappert, Gary, and Richard V. Knight. Cities in the 21st Century. Beverly Hills: Sage Publications, 1982.

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