Sancianco, G. G., & Alzona, E. (1975). The progress of the Philippines: Economic, administrative and political studies. National Historical Institute.
Citace podle Chicago (17th ed.)Sancianco, Gregorio Goson, a Encarnacion Alzona. The Progress of the Philippines: Economic, Administrative and Political Studies. Manila, Philippines: National Historical Institute, 1975.
Citace podle MLA (9th ed.)Sancianco, Gregorio Goson, a Encarnacion Alzona. The Progress of the Philippines: Economic, Administrative and Political Studies. National Historical Institute, 1975.
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