Ellis, Robert
Calculus with analytic geometry / Robert Ellis and Denny Gulick
Harcourt Brace Javanovich, 1978
 Buku Teks
Boddy, Michael
Legend of king o'Malley / Michael Boddy , Robert Ellis
Sydney, Currency Press, 1974
 Buku Teks
English this way English Language Services.
London Collier-Macmillan 1965,
 Buku Teks
Suenobu, Mineo
Japanese english: study of Japanese learners' simultaneous interpretation
Kobe University of Commerce, 1999
 Buku Teks
Bernard Amadeus Jaya
Optimal substitutions of dental fricatives by Indonesian learners of English
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2012
 UI - Skripsi Open