Gonzalez, S. R. (1970). Economic survey of Davao del Sur: Fieldwork report. Institute for Small-Scale Industries, University of the Philippines.
Chicagoスタイル(17版)引用形式Gonzalez, Sofronio R. Economic Survey of Davao Del Sur: Fieldwork Report. Quezon City: Institute for Small-Scale Industries, University of the Philippines, 1970.
MLA(9版)引用形式Gonzalez, Sofronio R. Economic Survey of Davao Del Sur: Fieldwork Report. Institute for Small-Scale Industries, University of the Philippines, 1970.
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