Shoemaker, P. J. (1991). Communication concepts 3 Gatekeeping. Sage Pub..
芝加哥风格引文Shoemaker, Pamela J. Communication Concepts 3 Gatekeeping. Newbury Park: Sage Pub., 1991.
MLA引文Shoemaker, Pamela J. Communication Concepts 3 Gatekeeping. Sage Pub., 1991.
警告：这些引文格式不一定是100％准确.