Wilka, K., & Fitzner, S. (1998). Distance Education "Lifeguards": Saving Students from Traditional Waters.
Citazione stile Chigago Style (17a edizione)Wilka, Kathy, e Sue Fitzner. Distance Education "Lifeguards": Saving Students from Traditional Waters. 1998.
Citatione MLA (9a ed.)Wilka, Kathy, e Sue Fitzner. Distance Education "Lifeguards": Saving Students from Traditional Waters. 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.