edited by Donald M. Bowman and Francis M. Fillerup
McGraw-Hill, 1963
Buku Teks SO
Gupita, Rajat, foreword
Harvard Business School, 1996
Buku Referensi
Brown, Wilfred
Heinemann, 1971
Buku Teks
Savage, Christopher I.
Hutchinson, 1975
Buku Teks SO
Brown, Alvin
Hibbert Printing, 1945
Buku Teks