Cita APA (7th ed.)

Worcester, D. A. A unified theory of external effects of social cost [microfilm]. Photoduplication Service, University of the Philippines Library,1976.

Cita Chicago (17th ed.)

Worcester, Dean A. A Unified Theory of External Effects of Social Cost [microfilm]. Quezon City: Photoduplication Service, University of the Philippines Library,1976.

Cita MLA (9th ed.)

Worcester, Dean A. A Unified Theory of External Effects of Social Cost [microfilm]. Photoduplication Service, University of the Philippines Library,1976.