Maramba, F. D., & Obias, E. D. (1978). Biogas and waste recycling: The Philippine experience. Maya Farms Division, Liberty Flour Mills.
Lua i Stíl Chicago (17ú heag.)Maramba, Felix D., agus Ennrico D. Obias. Biogas and Waste Recycling: The Philippine Experience. Metro Manila: Maya Farms Division, Liberty Flour Mills, 1978.
Lua MLA (9ú heag.)Maramba, Felix D., agus Ennrico D. Obias. Biogas and Waste Recycling: The Philippine Experience. Maya Farms Division, Liberty Flour Mills, 1978.
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