APA

(1972). Puerto Rico: (Active bulletin). Hato Rey, P.R: Advisory Council on Vocational and Technical Education.

Chicago

1972. Puerto Rico: (Active bulletin). Hato Rey, P.R: Advisory Council on Vocational and Technical Education.

Harvard

(1972). Puerto Rico: (Active bulletin). Hato Rey, P.R: Advisory Council on Vocational and Technical Education.

MLA

Puerto Rico: (Active bulletin). Hato Rey, P.R: Advisory Council on Vocational and Technical Education. 1972.