Cita APA (7th ed.)
Shapiro, A. M. (2007). Field guide to butterflies of the San Francisco Bay and Sacramento Valley regions. University of California Press.
Cita Chicago (17th ed.)
Shapiro, Arthur M. Field Guide to Butterflies of the San Francisco Bay and Sacramento Valley Regions. Berkeley: University of California Press, 2007.
Cita MLA (9th ed.)
Shapiro, Arthur M. Field Guide to Butterflies of the San Francisco Bay and Sacramento Valley Regions. University of California Press, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.