APA (7e ed.) Bronvermelding

National Development Group for Educational Innovation & Sumagaysay, L. S. (1980). In-service education for primary teachers: Design formulation. National Development Group for Educational Innovation.

Chicago (17e ed.) Bronvermelding

National Development Group for Educational Innovation en Lourdes S. Sumagaysay. In-service Education for Primary Teachers: Design Formulation. Manila: National Development Group for Educational Innovation, 1980.

MLA (9e ed.) Bronvermelding

National Development Group for Educational Innovation en Lourdes S. Sumagaysay. In-service Education for Primary Teachers: Design Formulation. National Development Group for Educational Innovation, 1980.