Walker, Marianne McGettigan
American law Institute Publishers, 1995
Buku Teks
[Fakultas Kedokteran Gigi Universitas Indonesia, Journal of Dentistry Indonesia], 2010
Artikel Jurnal
Walker, Warens S.
Shoe String Press, 1984
Buku Referensi
Greenwood Press, 1976
Buku Teks
Elsevier , 2013
Buku Teks