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
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 / by Harold G. Fraine
Richard D. Irwin, Inc. , 1962
 Buku Teks