Craig, Oman
Oxford University Press , 1982
Buku Teks
Ponny Retno Astuti, author
Grasindo, 2008
Buku Teks
Damanik, Hanna Derita Lasmaria, author
Universitas Indonesia, 2010
UI - Tesis (Open)
Gor`kiy, Aleksey Maksimovich, author
Foreign Languages Publishing House, 1954
Buku Teks
Jakarta Erlangga 1988,
Buku Teks