Style de citation APA (7e éd.)

Gregorio, E. 1. (1973). A proposed plan of supervision of health instruction in the public elementary schools in the city of Manila. s.n.].

Style de citation Chicago (17e éd.)

Gregorio, Elisa 1921. A Proposed Plan of Supervision of Health Instruction in the Public Elementary Schools in the City of Manila. [Quezon City: s.n.], 1973.

Style de citation MLA (9e éd.)

Gregorio, Elisa 1921. A Proposed Plan of Supervision of Health Instruction in the Public Elementary Schools in the City of Manila. s.n.], 1973.