Garstens, Helen L.
Macmillan, 1969
Buku Teks SO
Phares Odaffer, Randall Charles, Thomas Cooney, John Dossey, Jane Schielack
Pearson Addison Wesley, 2008
Buku Teks SO
Hinton, Gertrude D. M.
Fearon Publ., 1969
Buku Teks SO
Devine, Donald F.
John Wiley & Sons, 1983
Buku Teks
Beckmann, Sybilla
Pearson Addison Wesley, 2008
Buku Teks SO