Pulkina, I.M.
Russian Language Publishers, 1975
Buku Teks
Murray, John D. (John Damian)
Routledge, 2001
Buku Teks
Smirnitsky, A.I.
Higher School Publishing House, 1975
Buku Teks
Lusin, Natala
Baron's Education, 1992
Buku Referensi
Wade, Terence
New York : Oxford University Press, 2002
Buku Referensi