1.
Visitor payback : encouraging tourists to give money voluntarily to conserve the places they visit / Richard Denman, Peter Ashcroft
Autor:
Denman, Richard
Data Publicação:
1997
Coautor:
Ashcroft, Peter
2.
La experiencia britanica en la gestión del turismo en los parques nacionales y otras areas protegidas / Peter Ashcroft
Autor:
Ashcroft, Peter