Artikel Jurnal
Christie, Agatha, 1890-1976, author
Gramedia Pustaka Utama, 2018
Buku Teks
Segal, Gerald, 1953-, author
St. Martin's Press, 1992
Buku Teks
Casey, Edward S., 1939-, author
University of California Press, 1997
Buku Teks
Ntow, William Joseph, author
Taylor & Francis/Balkema, 2008
Buku Teks