Dyfyniad APA

Royal Geographical Society (Great Britain), Cater, E., & Lowman, G. (1994). Ecotourism: A sustainable option? Wiley.

Dyfyniad Arddull Chicago

Royal Geographical Society (Great Britain), Erlet Cater, and Gwen Lowman. Ecotourism: A Sustainable Option? Chichester ; New York: Wiley, 1994.

Dyfyniad MLA

Royal Geographical Society (Great Britain), et al. Ecotourism: A Sustainable Option? Wiley, 1994.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.