Παραπομπή APA

Wallace, D. A. (1967). Metropolitan open space from natural process: Reports on Open Space Research. Philadelphia: Institute for Environmental Studies.

Παραπομπή Chicago Style

Wallace, David A. Metropolitan Open Space From Natural Process: Reports On Open Space Research. Philadelphia: Institute for Environmental Studies, 1967.

Παραπομπή MLA

Wallace, David A. Metropolitan Open Space From Natural Process: Reports On Open Space Research. Philadelphia: Institute for Environmental Studies, 1967.

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