APA (7e ed.) Bronvermelding

Philippines (Republic) Office of Manpower Services. Employment Service Division. (1957). Philippine occupational classification with titles, codes and definitions. s.n.

Chicago (17e ed.) Bronvermelding

Philippines (Republic) Office of Manpower Services. Employment Service Division. Philippine Occupational Classification with Titles, Codes and Definitions. 224p.,Manila: s.n, 1957.

MLA (9e ed.) Bronvermelding

Philippines (Republic) Office of Manpower Services. Employment Service Division. Philippine Occupational Classification with Titles, Codes and Definitions. s.n, 1957.