Corbett, Jane Vincent
Appletton & lange , 1982
Buku Teks
Lippincott Williams & Wilkins , 2007
Buku Referensi
Feigl, Fritz, author
Elsevier, 1960
Buku Teks
Janda, Louis, author
John Wiley and Sons, 2001
Buku Teks
Stone, Linton
Macmillan, 1970
Buku Teks