Valderrama, H. S. (2007). A classification scheme for Philippine electric cooperatives for regulatory purposes. College of Business Administration, University of the Philippines.
Citazione stile Chigago Style (17a edizione)Valderrama, Helena S. A Classification Scheme for Philippine Electric Cooperatives for Regulatory Purposes. Quezon City: College of Business Administration, University of the Philippines, 2007.
Citatione MLA (9a ed.)Valderrama, Helena S. A Classification Scheme for Philippine Electric Cooperatives for Regulatory Purposes. College of Business Administration, University of the Philippines, 2007.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.