Inayanti, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2019
UI - Tesis (Membership)
Greenbaum, Sidney
Longman , 1990
Buku Teks
Ross, Janet, author
Harper & Row , 1965
Buku Teks
Jordan, R. R., author
Longman, 2001
Buku Teks
edited by Somers Gill
Frederick Warne, [1948]
Buku Referensi