Lua APA (7ú heag.)
Allred, S., & McDonald, L. (2015). Ponderosa: Big pine of the Southwest. The University of Arizona Press.
Lua i Stíl Chicago (17ú heag.)
Allred, Sylvester, agus Leigh McDonald. Ponderosa: Big Pine of the Southwest. Tucson, Arizona: The University of Arizona Press, 2015.
Lua MLA (9ú heag.)
Allred, Sylvester, agus Leigh McDonald. Ponderosa: Big Pine of the Southwest. The University of Arizona Press, 2015.
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