Adams, J. D. 1., Ritvo, R. A., Sargent, A. G., Blanchard, K. H. 1., Bradford, D. L., Brown, N., & Byrd, R. E. 1. (1983). The NTL managers' handbook. Arlington, Virginia: NTL Institute.

Adams, John D. 1942-, Roger A. Ritvo, Alice G. Sargent, Kenneth H. 1939- Blanchard, David L. Bradford, Nancy Brown, and Richard Evelyn 1888-1957 Byrd. The NTL Managers' Handbook. Arlington, Virginia: NTL Institute, 1983.

Adams, John D. 1942-, et al. The NTL Managers' Handbook. Arlington, Virginia: NTL Institute, 1983.