APA (7th ed.) Citation

Philippine Institute of Environmental Planners. (1979). PIEP directory, 1979. PIEP.

Chicago Style (17th ed.) Citation

Philippine Institute of Environmental Planners. PIEP Directory, 1979. Quezon City: PIEP, 1979.

MLA (9th ed.) Citation

Philippine Institute of Environmental Planners. PIEP Directory, 1979. PIEP, 1979.

Warning: These citations may not always be 100% accurate.