Cita APA (7th ed.)
Olson, C., & Maud, R. (2000). Selected letters. University of California Press.
Cita Chicago (17th ed.)
Olson, Charles, i Ralph Maud. Selected Letters. Berkeley: University of California Press, 2000.
Cita MLA (9th ed.)
Olson, Charles, i Ralph Maud. Selected Letters. University of California Press, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.