Ramsey, GC
Collins , 1968
Buku Teks
Christie, Agatha, 1890-1976
Gramedia Pustaka Utama, 2016
Buku Teks
Christie, Agatha, 1890-1976
Gramedia Pustaka Utama, 2022
Buku Teks
Alya Yumna
Fakultas Teknik Universitas Indonesia, 2020
UI - Skripsi Membership
Christie, Francis
Oxford University Press, 1989
Buku Teks SO