Perfecto, W. S. (1978). Education and manpower development. Technology Resource Center.
Citazione stile Chigago Style (17a edizione)Perfecto, Waldo S. Education and Manpower Development. Makati, Metro Manila: Technology Resource Center, 1978.
Citatione MLA (9a ed.)Perfecto, Waldo S. Education and Manpower Development. Technology Resource Center, 1978.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.