Collins, Allan M.; Quillian, M. R. (1969). «Retrieval time from semantic memory». Journal of verbal learning and verbal behavior8 (2): 240–247. doi:10.1016/S0022-5371(69)80069-1. PMID615603750.
Collins, Allan M.; Quillian, M. R. (1970). «Does category size affect categorization time?». Journal of verbal learning and verbal behavior9 (4): 432–438. doi:10.1016/S0022-5371(70)80084-6.
Collins, Allan M.; Quillian, M. R. (1969). «Retrieval time from semantic memory». Journal of verbal learning and verbal behavior8 (2): 240–247. doi:10.1016/S0022-5371(69)80069-1. PMID615603750.