Ewing, J.H.
Logic for beginners
Student Outline Co. , 1960
 Buku Teks
Wilkes, Angela
German for beginners
Passport Books, [Date of publication not identified]
 Buku Teks SO
Wilkes, Angela
French for beginners
Passport Books, 1987
 Buku Teks SO
Wilkes, Angela
German for beginners
Chicago: A Division of NTC Pub., 1987,
 Buku Referensi
Gordon, W. Terrence
Saussure for beginners
Writer and Readers Pubishing, 1996
 Buku Teks SO