Burrows, William E.
W.B. Saunders, 1959
Buku Teks SO
Arora, D.R.,author
CBS , 2009
Buku Teks SO
edited by Connie R. Mahon, Donald C. Lehman, George Manuselis
Elsevier, 2015
Buku Teks SO
edited by Connie R. Mahon, Dona Lehman, George Manuselis
Elsevier, 2015
Buku Teks SO
Arora, D.R.
CBS Publishers, 2015
Buku Teks SO