Mehegan, David (January 26, 2002). "Little, Brown Shrinking Again". Boston Globe (3rd ed.). Boston, Mass. pp. –1. ISSN0743-1791. ProQuest405447754.
"Sale to International Thomson of Publisher Is Set for $66 Million". Wall Street Journal. New York, N.Y. May 8, 1985. p. 1. ISSN0099-9660. ProQuest397970242.
Landro, Laura (October 15, 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. New York, N.Y. p. 1. ISSN0099-9660. ProQuest397963634.
Diamond, Howard (November 24, 1992). "Thomson Acquires Course Technology, Inc". Business Wire. New York, N.Y. p. 1. ProQuest447043731.
"The Thomson Corporation to Acquire Select Harcourt Business Units From Reed Elsevier". Business Wire. New York, N.Y. October 27, 2000. p. 1. ProQuest445856898.
"Thomson Learning Acquires ARCO Imprint from IDGB; Peterson's to Provide Consumers a Singular Resource for a Wide Range of Test-Prep Materials and Information". Business Wire. New York, N.Y. June 12, 2000. p. 1. ProQuest445835057.
Mehegan, David (January 26, 2002). "Little, Brown Shrinking Again". Boston Globe (3rd ed.). Boston, Mass. pp. –1. ISSN0743-1791. ProQuest405447754.
"Sale to International Thomson of Publisher Is Set for $66 Million". Wall Street Journal. New York, N.Y. May 8, 1985. p. 1. ISSN0099-9660. ProQuest397970242.
Landro, Laura (October 15, 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. New York, N.Y. p. 1. ISSN0099-9660. ProQuest397963634.