Bitter, Gary G.
Allyn and Bacon, 1989
Buku Teks SO
Phares Odaffer, Randall Charles, Thomas Cooney, John Dossey, Jane Schielack
Pearson Addison Wesley, 2008
Buku Teks SO
Garstens, Helen L.
Macmillan, 1969
Buku Teks SO
Devine, Donald F.
John Wiley & Sons, 1977
Buku Teks SO
Paige, Donald D.
Prindle, Weber & Schmidt, 1969
Buku Teks SO