APA-referens (7:e uppl.)

(1997). Sustainable livelihood options for the Philippines: An information kit. Urban-lowland ecosystem. Department of Environment and Natural Resources.

Chicago-referens (17:e uppl.)

Sustainable Livelihood Options for the Philippines: An Information Kit. Urban-lowland Ecosystem. Diliman, Q.C: Department of Environment and Natural Resources, 1997.

MLA-referens (9:e uppl.)

Sustainable Livelihood Options for the Philippines: An Information Kit. Urban-lowland Ecosystem. Department of Environment and Natural Resources, 1997.