Citazione Stile APA (7a Edizione)

Maramba, F. D., & Obias, E. D. (1978). Biogas and waste recycling: The Philippine experience. Maya Farms Division, Liberty Flour Mills.

Citazione stile Chigago Style (17a edizione)

Maramba, Felix D., e Enrico D. Obias. Biogas and Waste Recycling: The Philippine Experience. Metro Manila: Maya Farms Division, Liberty Flour Mills, 1978.

Citatione MLA (9a ed.)

Maramba, Felix D., e Enrico D. Obias. Biogas and Waste Recycling: The Philippine Experience. Maya Farms Division, Liberty Flour Mills, 1978.