Pelfrey, William
Billy, Alfred, and General Motors: the story of two unique men, a legendary company, and a remarkable time in American history
American Management Association, 2006
 eBooks
Greenewalt, Crawford H., 1902-1993
The Uncommon man
McGraw-Hill, 1959
 Buku Teks SO
Greeg, Davis W.
Group life insurance : an analysis of concepts, contracts, costs, and company practices / Davis W. Greeg
Richard D. Irwin, Inc., 1960
 Buku Teks
Gregg, Davis Weiner
Group life insurance : an analysis of concepts, contracts, costs and company practices
University of Pennsylvania by R.D. Irwin, 1962
 Buku Teks
Fraine, Harold G.
Valuation of securities holdings of life insurance companies
Richard D. Irwin, 1962
 Buku Teks