Dyfyniad APA

Astroff,Milton, & Abbey,James R. (2011). Convention management & services (8.). Waterbury Press.

Dyfyniad Arddull Chicago

Astroff,Milton, and Abbey,James R. Convention Management & Services. 8. New Jessey: Waterbury Press, 2011.

Dyfyniad MLA

Astroff,Milton, and Abbey,James R. Convention Management & Services. 8. Waterbury Press, 2011.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.