Donald E. Hawkins

The formulation and validation of principles for industrial recreation in the United States

Donald E. Hawkins, 1970 .

Ecotourism as a worldwide phenomenon.

Donald E. Hawkins, H. Ceballos-Lascuráin, K. Lindberg, 1993 .

A Protected Areas Ecotourism Competitive Cluster Approach to Catalyse Biodiversity Conservation and Economic Growth in Bulgaria

Donald E. Hawkins, D. Hawkins, 2004 .

Ecotourism : A Guide for Planners and Managers

Donald E. Hawkins, K. Lindberg, D. Hawkins, 1998 .