Goth, Andres, author
Mosby, 1972
Buku Teks
the American Society, 2018
Majalah, Jurnal, Buletin
Sice, Jean
W.B. Saunders, 1962
Buku Teks
Beckman, Harry, author
W.B. Saunders, 1952
Buku Referensi
edited by Harold Kalant, Walter H.E. Roschlau
Oxford University Press, 1998
Buku Teks