APA استشهاد

Lockwood A. (2001). Tourism and hospitality in the 21st century.

استشهاد بنمط شيكاغو

Lockwood A. Tourism and Hospitality in the 21st Century. Routledge,London, 2001.

MLA استشهاد

Lockwood A. Tourism and Hospitality in the 21st Century. 2001.