Pennel, Francis W; Emerson, Alfred E; McFarland, F T; Funkhouser, W D; Ricker, William E; Clay, William M; Haag, H B(Lexington, Transylvania College, 1940)
Staszko, Ray; Walls, Jerry G(Neptune City, NJ : T.F.H. Publications ; Lanham, MD : Distributed in the U.S. to the bookstore and library trade by National Book Network, 1994)
Boell, E J; Costello, D P; Detwiler, S R; Fankhauser, G; Holtfreter, J; Nicholas, J S; Rose, S M; Rudnick, D; Stone, L S(New York Academy of Sciences., 1948)