Whitlock, W., Romer, K. v., & Becker, R. H. Nature based tourism: An annotated bibliography. Regional Resources Development Group of the Strom Thurmond Institute.
Cita Chicago (17th ed.)Whitlock, Wendy, Kevin van Romer, i Robert H. Becker. Nature Based Tourism: An Annotated Bibliography. [South Carolina]: Regional Resources Development Group of the Strom Thurmond Institute.
Cita MLA (9th ed.)Whitlock, Wendy, et al. Nature Based Tourism: An Annotated Bibliography. Regional Resources Development Group of the Strom Thurmond Institute.
Atenció: Aquestes cites poden no estar 100% correctes.