Philippines (Republic) Department of Agriculture and Natural Resources, Mariano, J. A., Romero, I. A., & Tingzon, J. A. (1954). Soil survey of Ilocos Sur Province, Philippines. Bureau of Printing.
Citace podle Chicago (17th ed.)Philippines (Republic) Department of Agriculture and Natural Resources, Juan A. Mariano, Isidoro A. Romero, a Jorge A. Tingzon. Soil Survey of Ilocos Sur Province, Philippines. Manila: Bureau of Printing, 1954.
Citace podle MLA (9th ed.)Philippines (Republic) Department of Agriculture and Natural Resources, et al. Soil Survey of Ilocos Sur Province, Philippines. Bureau of Printing, 1954.
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