Cassell (publisher) (English Wikipedia)

"About The Continuum International Publishing Group". The Continuum International Publishing Group (on Internet Archive). 15 September 2000. Archived from the original on 15 September 2000. Retrieved 21 December 2023.

curiosmith.com

Hammer, Alexander Richard (25 December 1969). "University Computing in Move; Butler Aviation Wins Round – LTV Aerospace to Sell" – "Companies Plan Merger Actions". Business and Finance. The New York Times. Vol. 131, no. 45317 (Late ed.). pp. 47 & 50. ISSN 0362-4331. Archived from the original on 3 July 2018. Retrieved 24 March 2018. permalink 1(subscription required) & permalink 2(subscription required)
"Expansion Planned by Crowel Collier". The New York Times. Vol. 118, no. 40447 (Late City ed.). 20 October 1968. p. F17. ISSN 0362-4331. Retrieved 1 September 2019.
"Macmillan Unit Acquired by CBS". The New York Times. Vol. 131, no. 45317 (Late ed.). 18 May 1982. p. D10. ISSN 0362-4331. Retrieved 24 March 2018. permalink(subscription required)

Hammer, Alexander Richard (25 December 1969). "University Computing in Move; Butler Aviation Wins Round – LTV Aerospace to Sell" – "Companies Plan Merger Actions". Business and Finance. The New York Times. Vol. 131, no. 45317 (Late ed.). pp. 47 & 50. ISSN 0362-4331. Archived from the original on 3 July 2018. Retrieved 24 March 2018. permalink 1(subscription required) & permalink 2(subscription required)
"Macmillan Unit Acquired by CBS". The New York Times. Vol. 131, no. 45317 (Late ed.). 18 May 1982. p. D10. ISSN 0362-4331. Retrieved 24 March 2018. permalink(subscription required)

"Philip Sturrock". Archived from the original on 22 August 2018. Retrieved 24 March 2018.

"A Brief History of Orion Publishing Group". Orion Publishing Group. n.d. Archived from the original on 6 March 2012. Retrieved 26 January 2010.
Hammer, Alexander Richard (25 December 1969). "University Computing in Move; Butler Aviation Wins Round – LTV Aerospace to Sell" – "Companies Plan Merger Actions". Business and Finance. The New York Times. Vol. 131, no. 45317 (Late ed.). pp. 47 & 50. ISSN 0362-4331. Archived from the original on 3 July 2018. Retrieved 24 March 2018. permalink 1(subscription required) & permalink 2(subscription required)
"Philip Sturrock". Archived from the original on 22 August 2018. Retrieved 24 March 2018.
"About The Continuum International Publishing Group". The Continuum International Publishing Group (on Internet Archive). 15 September 2000. Archived from the original on 15 September 2000. Retrieved 21 December 2023.

Hammer, Alexander Richard (25 December 1969). "University Computing in Move; Butler Aviation Wins Round – LTV Aerospace to Sell" – "Companies Plan Merger Actions". Business and Finance. The New York Times. Vol. 131, no. 45317 (Late ed.). pp. 47 & 50. ISSN 0362-4331. Archived from the original on 3 July 2018. Retrieved 24 March 2018. permalink 1(subscription required) & permalink 2(subscription required)
"Expansion Planned by Crowel Collier". The New York Times. Vol. 118, no. 40447 (Late City ed.). 20 October 1968. p. F17. ISSN 0362-4331. Retrieved 1 September 2019.
"Macmillan Unit Acquired by CBS". The New York Times. Vol. 131, no. 45317 (Late ed.). 18 May 1982. p. D10. ISSN 0362-4331. Retrieved 24 March 2018. permalink(subscription required)