Παραπομπή APA

(2008). Peterson’s graduate programs in the physical sciences, mathematics, agricultural sciences, the environment & natural resources. Princeton, N.J: Peterson’s.

Παραπομπή Chicago Style

Peterson’s Graduate Programs in the Physical Sciences, Mathematics, Agricultural Sciences, the Environment & Natural Resources. Princeton, N.J: Peterson’s, 2008.

Παραπομπή MLA

Peterson’s Graduate Programs in the Physical Sciences, Mathematics, Agricultural Sciences, the Environment & Natural Resources. Princeton, N.J: Peterson’s, 2008.

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