O'Connor, P., & Haden, E. F. (1957). Oral drill in Spanish. Houghton Mifflin.
芝加哥风格引文O'Connor, Patricia, 与 Ernest Faber Haden. Oral Drill in Spanish. Boston: Houghton Mifflin, 1957.
MLA引文O'Connor, Patricia, 与 Ernest Faber Haden. Oral Drill in Spanish. Houghton Mifflin, 1957.
警告：这些引文格式不一定是100％准确.