Institute of Vocational Training and Development. Information and Documentation Services. Catalogue of training materials. Part 1-Print. National Manpower and Youth Council.
Chicago-referens (17:e uppl.)Institute of Vocational Training and Development. Information and Documentation Services. Catalogue of Training Materials. Part 1-Print. Taguig: National Manpower and Youth Council.
MLA-referens (9:e uppl.)Institute of Vocational Training and Development. Information and Documentation Services. Catalogue of Training Materials. Part 1-Print. National Manpower and Youth Council.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.