Boyd, M., & Worcester, D. E. (1968). Contemporary America: Issues and problems. Allyn and Bacon.
芝加哥风格引文Boyd, Maurice, 与 Donald Emmet Worcester. Contemporary America: Issues and Problems. Boston: Allyn and Bacon, 1968.
MLA引文Boyd, Maurice, 与 Donald Emmet Worcester. Contemporary America: Issues and Problems. Allyn and Bacon, 1968.
警告：这些引文格式不一定是100％准确.