Lua APA (7ú heag.)
ebrary, Inc, & Foster, J. (1997). Valuing nature?: Ethics, economics and the environment. Routledge.
Lua i Stíl Chicago (17ú heag.)
ebrary, Inc, agus John Foster. Valuing Nature?: Ethics, Economics and the Environment. London ; New York: Routledge, 1997.
Lua MLA (9ú heag.)
ebrary, Inc, agus John Foster. Valuing Nature?: Ethics, Economics and the Environment. Routledge, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.