(2011). Peterson's graduate programs in the physical sciences, mathematics, agricultural sciences, the environment & natural resources 2011 (45th ed.). Lawreceville, N.J.: Peterson's.
Παραπομπή Chicago StylePeterson's Graduate Programs in the Physical Sciences, Mathematics, Agricultural Sciences, the Environment & Natural Resources 2011. 45th ed. Lawreceville, N.J.: Peterson's, 2011.
Παραπομπή MLAPeterson's Graduate Programs in the Physical Sciences, Mathematics, Agricultural Sciences, the Environment & Natural Resources 2011. 45th ed. Lawreceville, N.J.: Peterson's, 2011.
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