New York Public Library. (1989). The New York Public Library desk reference. Webster's New World.
Citazione stile Chigago Style (17a edizione)New York Public Library. The New York Public Library Desk Reference. New York: Webster's New World, 1989.
Citatione MLA (9a ed.)New York Public Library. The New York Public Library Desk Reference. Webster's New World, 1989.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.