APA

Puerto Rico, . (1954). Income tax act of 1954: (no.91, approved June 29, 1954). San Juan, P. R: Department of the Treasury, Purchase and Supply Service Division.

Chicago

Puerto Rico, . 1954. Income tax act of 1954: (no.91, approved June 29, 1954). San Juan, P. R: Department of the Treasury, Purchase and Supply Service Division.

Harvard

Puerto Rico, . (1954). Income tax act of 1954: (no.91, approved June 29, 1954). San Juan, P. R: Department of the Treasury, Purchase and Supply Service Division.

MLA

Puerto Rico, . Income tax act of 1954: (no.91, approved June 29, 1954). San Juan, P. R: Department of the Treasury, Purchase and Supply Service Division. 1954.