Niguidula, J. E., & Villanueva, R. B. An evaluation of the Philippine Virginia Tobacco Administation.
Lua i Stíl Chicago (17ú heag.)Niguidula, Joel E., agus Raul B. Villanueva. An Evaluation of the Philippine Virginia Tobacco Administation.
Lua MLA (9ú heag.)Niguidula, Joel E., agus Raul B. Villanueva. An Evaluation of the Philippine Virginia Tobacco Administation.
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