Pigram, J. (1976). The resource base for outdoor recreation (Rev. [ed.].).
Cita Chicago (17th ed.)Pigram, J.J.J. The Resource Base for Outdoor Recreation. Rev. [ed.]. 1976.
Cita MLA (9th ed.)Pigram, J.J.J. The Resource Base for Outdoor Recreation. Rev. [ed.]. 1976.
Atenció: Aquestes cites poden no estar 100% correctes.