Irwin, K. R. (1998). Professional Reference Service at the Internet Public Library with "Freebie" Librarians.
Citazione stile Chigago Style (17a edizione)Irwin, Kenneth R. Professional Reference Service at the Internet Public Library with "Freebie" Librarians. 1998.
Citatione MLA (9a ed.)Irwin, Kenneth R. Professional Reference Service at the Internet Public Library with "Freebie" Librarians. 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.