Schrag, A. F., Poland, R. P., & Popham, E. L. (1987). A system for teaching business education (2nd ed.). Gregg Division, McGraw-Hill.
芝加哥风格引文Schrag, Adele Frisbie, Robert P. Poland, 与 Estelle L. Popham. A System for Teaching Business Education. 2nd ed. New York: Gregg Division, McGraw-Hill, 1987.
MLA引文Schrag, Adele Frisbie, et al. A System for Teaching Business Education. 2nd ed. Gregg Division, McGraw-Hill, 1987.
警告：这些引文格式不一定是100％准确.