Morgan, D. L., Krueger, R. A., & King, J. A. (1998). The Focus group kit. Sage.
芝加哥风格引文Morgan, David L., Richard A. Krueger, 与 Jean A. King. The Focus Group Kit. Thousand Oaks, Calif: Sage, 1998.
MLA引文Morgan, David L., et al. The Focus Group Kit. Sage, 1998.
警告：这些引文格式不一定是100％准确.