ebrary, Inc, Jorna, R. J., Heusden, B. v., & Posner, R. (1993). Signs, search and communication: Semiotic aspects of artificial intelligence. W. de Gruyter.
芝加哥风格引文ebrary, Inc, René J. Jorna, Barend van Heusden, 与 Roland Posner. Signs, Search and Communication: Semiotic Aspects of Artificial Intelligence. Berlin ; New York: W. de Gruyter, 1993.
MLA引文ebrary, Inc, et al. Signs, Search and Communication: Semiotic Aspects of Artificial Intelligence. W. de Gruyter, 1993.
警告：这些引文格式不一定是100％准确.