APA-viite

Sunil Gupta, S. (1998). Tourism towards 21st century (1.). Deep & Deep.

Chicago-tyylinen lähdeviittaus

Sunil Gupta, S.P. Tourism Towards 21st Century. 1. New Delhi: Deep & Deep, 1998.

MLA-viite

Sunil Gupta, S.P. Tourism Towards 21st Century. 1. Deep & Deep, 1998.