1.		Protected areas, conservation and tourism – financing the sustainable dream / Paul Anthony Whitelaw, Brian E.M. King, Denis Tolkach Autor: Whitelaw, Paul A. Coautor: ; King, Brian E. M. Tolkach, Denis COTA(S): RE-926
2.		Backpackers in Hong Kong - motivations, preferences and contribuition to sustainable tourism / Lung Ching Nok [et al.] Resp- Sec.: Lung, Ching Nok suntikul, Wantanee Agyeiwaah, Elizabeth Tolkach, Denis COTA(S): RE-1562
3.		Ethics of Chineses & Western tourist in Hong Kong / Denis Tolkach, Stephen Pratt and Christine Y. H. Zeng Autor: Tolkach, Denis Coautor: ; Pratt, Stephen Zeng, Christine Y. H. COTA(S): RE-1253