Henschel, Astrid
German verb drills
Passport Books, 1994
Buku Teks SO
Graham, Stuart
The french verb book
Cambridge University Press , 1994
Buku Teks SO
Haider, Hubert
Verb second phenomena in Germanic
Foris Publications, 1986
Buku Teks
Verb Architecture boogazine
Osanbashi Pier, 2000
Buku Teks SO
Juilland, Alphonse
The English verb system
Mouton, 1973
Buku Teks SO