Worcester, D. A. A unified theory of external effects of social cost [microfilm]. Photoduplication Service, University of the Philippines Library,1976.
Citazione stile Chigago Style (17a edizione)Worcester, Dean A. A Unified Theory of External Effects of Social Cost [microfilm]. Quezon City: Photoduplication Service, University of the Philippines Library,1976.
Citatione MLA (9a ed.)Worcester, Dean A. A Unified Theory of External Effects of Social Cost [microfilm]. Photoduplication Service, University of the Philippines Library,1976.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.