Gaya APA

Daviddoff, P, G., Davidoff, D, C. (1990). Air Fares And Ticketing (Ed. 2). America: Prentice Hall.

Gaya MLA

Daviddoff, Philip, G.., Davidoff, Doris, C.. "Air Fares And Ticketing". Ed. 2 America: Prentice Hall, 1990. Text.