APA aipamena

Yates, C. S. (1992). May I Help You?: (English in Tourism). New York: Prentice-Hall.

Chicago Style aipamena

Yates, Christopher St.j. May I Help You?: (English in Tourism). New York: Prentice-Hall, 1992.

MLA aipamena

Yates, Christopher St.j. May I Help You?: (English in Tourism). New York: Prentice-Hall, 1992.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.