National Development Group for Educational Innovation & Sumagaysay, L. S. (1980). In-service education for primary teachers: Design formulation. National Development Group for Educational Innovation.
Citazione stile Chigago Style (17a edizione)National Development Group for Educational Innovation e Lourdes S. Sumagaysay. In-service Education for Primary Teachers: Design Formulation. Manila: National Development Group for Educational Innovation, 1980.
Citatione MLA (9a ed.)National Development Group for Educational Innovation e Lourdes S. Sumagaysay. In-service Education for Primary Teachers: Design Formulation. National Development Group for Educational Innovation, 1980.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.