Shulman, Eden (12 Feb, 2015) «Archived copy». Archivado desde el original el 2 de mayo de 2015. Consultado el 4 de junio de 2015. BetaBoston - Boston Globe
Mehegan, David (26 de enero de 2002). «LITTLE, BROWN SHRINKING AGAIN: [THIRD Edition]». Boston Globe; Boston, Mass. (Boston, Mass., United States, Boston, Mass.). p. -1. ISSN0743-1791. ProQuest405447754.
«Sale to International Thomson of Publisher Is Set for $66 Million». Wall Street Journal, Eastern edition; New York, N.Y. (New York, N.Y., United States, New York, N.Y.). 8 de mayo de 1985. p. 1. ISSN0099-9660. ProQuest397970242.
Landro, Laura (15 de octubre de 1986). «SFN to Sell Unit to Time For $520 Million --- Sale of Another Subsidiary To a Canadian Concern Is Set for $270 Million». Wall Street Journal, Eastern edition; New York, N.Y. (New York, N.Y., United States, New York, N.Y.). p. 1. ISSN0099-9660. ProQuest397963634.
Mehegan, David (26 de enero de 2002). «LITTLE, BROWN SHRINKING AGAIN: [THIRD Edition]». Boston Globe; Boston, Mass. (Boston, Mass., United States, Boston, Mass.). p. -1. ISSN0743-1791. ProQuest405447754.
«Sale to International Thomson of Publisher Is Set for $66 Million». Wall Street Journal, Eastern edition; New York, N.Y. (New York, N.Y., United States, New York, N.Y.). 8 de mayo de 1985. p. 1. ISSN0099-9660. ProQuest397970242.
Landro, Laura (15 de octubre de 1986). «SFN to Sell Unit to Time For $520 Million --- Sale of Another Subsidiary To a Canadian Concern Is Set for $270 Million». Wall Street Journal, Eastern edition; New York, N.Y. (New York, N.Y., United States, New York, N.Y.). p. 1. ISSN0099-9660. ProQuest397963634.
Diamond, Howard (24 de noviembre de 1992). «Thomson Acquires Course Technology, Inc.». Business Wire; New York (New York, United States, New York). p. 1. ProQuest447043731.
Editors, Business (27 de octubre de 2000). «The Thomson Corporation to Acquire Select Harcourt Business Units From Reed Elsevier». Business Wire; New York (New York, United States, New York). p. 1. ProQuest445856898.
Shulman, Eden (12 Feb, 2015) «Archived copy». Archivado desde el original el 2 de mayo de 2015. Consultado el 4 de junio de 2015. BetaBoston - Boston Globe