"National Bus Company". Commercial Motor. Temple Press. 3 January 1969. p. 27. Retrieved 14 January 2024.
"Sale of Cambus sparks a pre Christmas rush". Commercial Motor. Temple Press. 13 December 1986. p. 18. Retrieved 14 January 2024. Cambus has operated since September 1984, when it was separated from the Eastern Counties Omnibus Company.
"Eastern Counties sold off". Commercial Motor. Temple Press. 7 March 1987. p. 22. Retrieved 14 January 2024.
"[untitled]". Commercial Motor. Temple Press. 10 December 1987. p. 18. Retrieved 14 January 2024.