Willcutt, R. E., Spikell, M. A., & Greenes, C. E. (1974). Multibase activities. Creative Publications.
芝加哥风格引文Willcutt, Robert E., Mark A. Spikell, 与 Carole E. Greenes. Multibase Activities. Palo Alto, Ca.: Creative Publications, 1974.
MLA引文Willcutt, Robert E., et al. Multibase Activities. Creative Publications, 1974.
警告：这些引文格式不一定是100％准确.