(1979). Communication concepts and skills / Robert Hopper and Jack L. Whitehead, Jr.
芝加哥风格引文Communication Concepts and Skills / Robert Hopper and Jack L. Whitehead, Jr. 1979.
MLA引文Communication Concepts and Skills / Robert Hopper and Jack L. Whitehead, Jr. 1979.
警告：这些引文格式不一定是100％准确.