APA (7th ed.) Citation

Black, R., & Crabtree, A. (2007). Quality assurance and cerfification in ecotourism. CABI.

Chicago Style (17th ed.) Citation

Black, Rosemary, and Alice Crabtree. Quality Assurance and Cerfification in Ecotourism. Wallingford: CABI, 2007.

MLA (9th ed.) Citation

Black, Rosemary, and Alice Crabtree. Quality Assurance and Cerfification in Ecotourism. CABI, 2007.