APA (7th ed.) Zitazioa
Wray, R. D. (2009). Christmas trees for pleasure and profit (4th ed.). Rutgers University Press.
Chicago Style (17th ed.) Zitazioa
Wray, Robert D. Christmas Trees for Pleasure and Profit. 4th ed. New Brunswick, N.J.: Rutgers University Press, 2009.
MLA (9th ed.) Zitazioa
Wray, Robert D. Christmas Trees for Pleasure and Profit. 4th ed. Rutgers University Press, 2009.
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