Davis, Philip J., author
Blaisdell Pub., 1967
Buku Teks
Edinburgh University Press, 1966
Buku Teks
Edina Noor Utami, author
2010
UI - Skripsi (Membership)
Soep, author
Jurusan Keperawatan Poltekes Kemenkes Medan, 2011
Artikel Jurnal
Sze, Philip
Iowa Wm.C.Brown Pub., 1993
Buku Teks