Popham, W. J., & Baker, E. L. (1970). Systematic instruction. Prentice-Hall.
芝加哥风格引文Popham, W. James, 与 Eva L. Baker. Systematic Instruction. Englewood Cliffs, N.J.: Prentice-Hall, 1970.
MLA引文Popham, W. James, 与 Eva L. Baker. Systematic Instruction. Prentice-Hall, 1970.
警告：这些引文格式不一定是100％准确.