Brenner, G., Ford, M., & Sullivan, P. (2007). Celebrate: Holidays in the U.S.A (2nd ed.). Washington: Office of English Language Programs. United States Department of State.
Dyfyniad Arddull ChicagoBrenner, Gail, Masha Ford, και Patricia Sullivan. Celebrate: Holidays in the U.S.A. 2nd ed. Washington: Office of English Language Programs. United States Department of State, 2007.
Dyfyniad MLABrenner, Gail, Masha Ford, και Patricia Sullivan. Celebrate: Holidays in the U.S.A. 2nd ed. Washington: Office of English Language Programs. United States Department of State, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.