Cita APA (7th ed.)
Wojahn, D. (2011). World tree. University of Pittsburgh Press.
Cita Chicago (17th ed.)
Wojahn, David. World Tree. Pittsburgh, Pennsylvania: University of Pittsburgh Press, 2011.
Cita MLA (9th ed.)
Wojahn, David. World Tree. University of Pittsburgh Press, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.