Whitsitt, M. E. (1988). Feasibility study manual for cooperatives. Cooperative Foundation Philippines.
Lua i Stíl Chicago (17ú heag.)Whitsitt, Mac E. Feasibility Study Manual for Cooperatives. Quezon City: Cooperative Foundation Philippines, 1988.
Lua MLA (9ú heag.)Whitsitt, Mac E. Feasibility Study Manual for Cooperatives. Cooperative Foundation Philippines, 1988.
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