Walker, S. (2009). Travel resources: An annotated guide. Scarecrow Press.
Cita Chicago (17th ed.)Walker, Stephen. Travel Resources: An Annotated Guide. Lanham, Md.: Scarecrow Press, 2009.
Cita MLA (9th ed.)Walker, Stephen. Travel Resources: An Annotated Guide. Scarecrow Press, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.