Hopkins, D. S., & Bailey, E. L. (1970). Customer service: A progress report. The Conference Board.
芝加哥风格引文Hopkins, David S., 与 Earl L. Bailey. Customer Service: A Progress Report. [New York]: The Conference Board, 1970.
MLA引文Hopkins, David S., 与 Earl L. Bailey. Customer Service: A Progress Report. The Conference Board, 1970.
警告：这些引文格式不一定是100％准确.