Beck, R. C. (1990). Motivation: Theories and principles (3rd ed.). Prentice Hall.
芝加哥风格引文Beck, Robert C. Motivation: Theories and Principles. 3rd ed. Englewood Cliffs, N.J: Prentice Hall, 1990.
MLA引文Beck, Robert C. Motivation: Theories and Principles. 3rd ed. Prentice Hall, 1990.
警告：这些引文格式不一定是100％准确.