Umaly, R., & Cuvin, M. L. A. (1988). Limnology: Laboratory and field guide, physico-chemical factors, biological factors. National Bookstore.
Lua i Stíl Chicago (17ú heag.)Umaly, Ruben, agus Ma. Lourdes A. Cuvin. Limnology: Laboratory and Field Guide, Physico-chemical Factors, Biological Factors. Manila: National Bookstore, 1988.
Lua MLA (9ú heag.)Umaly, Ruben, agus Ma. Lourdes A. Cuvin. Limnology: Laboratory and Field Guide, Physico-chemical Factors, Biological Factors. National Bookstore, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.