National internal revenue code, Commonwealth act no. 466. (In force and effect July 1, 1939).

Report of the Tax Commission of the Philippines on national internal revenue laws.

Internal revenue code, 1939. Printed as vol. 53, part 1, U. S. Statutes at large, 76th Congress, first session.

The internal revenue tax system of the Philippines revised as of January 1, 1935-.

Eighteenth annual report of the collector of internal revenue of the Philippine islands to the honorable, the secretary of finance, for the fiscal year 1921 ended December 31, 1921

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Regulations. no. 1-.

Revenue regulations updated a comprehensive update of internal regulations from 1913 to 1984

Internal taxation in the Philippines by Hord, John S.

Report. 2d.

A tax and a pox on mining by Dela Paz, Dean