Phonological investigations
edited by Fisiak Jacek and Stanislaw Pupels
John Benjamins B.V., 1992
 Buku Teks SO
Christie, Agatha, 1890-1976
Tiga belas kasus = The thirteen problems
Gramedia Pustaka Utama, 2017
 Buku Teks SO
Christie, Agatha, 1890-1976
Tiga belas kasus = The thirteen problems
Gramedia Pustaka Utama, 2018
 Buku Teks SO
Husserl, Edmund
The Shorter logical investigations
Routledge, 2001
 Buku Teks SO
Hoefnagels, Marielle
Biology : concepts and investigations
McGraw-Hill, Higher Education, 2009
 Buku Teks