Wales, Hugh G.
The University of Illinois Press , 1951
Buku Teks
Richard D. Irwin, Inc. , 1958
Buku Teks
Agnew, Hugh E.
McGraw-Hill Book , 1950
Buku Teks
Holloway, Robert J., author
John Wiley & Sons, 1968
Buku Teks
Agnew, Hugh E.
McGraw-Hill , 1951
Buku Teks