Villegas, B. M. (1973). Developing products for the low-income groups. Center for Research and Communication.
Chicagoスタイル(17版)引用形式Villegas, Bernardo M. Developing Products for the Low-income Groups. Manila, Philippines: Center for Research and Communication, 1973.
MLA(9版)引用形式Villegas, Bernardo M. Developing Products for the Low-income Groups. Center for Research and Communication, 1973.
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