Gaya APA

Sloan, P. et al (2009). Sustainability in the hospitality industry : principles of sustainable operations . Amsterdam: Elsevier-Butterworth-Heinemann.

Gaya MLA

Sloan, Philip. et al. "Sustainability in the hospitality industry : principles of sustainable operations". Amsterdam: Elsevier-Butterworth-Heinemann, 2009. BUKU.