APA (7. basım) Alıntı
ebrary, Inc, Black, R., & Crabtree, A. (2007). Quality assurance and certification in ecotourism. CABI Pub..
Chicago Style (17. basım) Atıf
ebrary, Inc, Rosemary Black, ve Alice Crabtree. Quality Assurance and Certification in Ecotourism. Cambridge, MA ; Wallingford: CABI Pub., 2007.
MLA (9th ed.) Atıf
ebrary, Inc, et al. Quality Assurance and Certification in Ecotourism. CABI Pub., 2007.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..