Goody, Esther N
Question and politeness
Cambridge University Press, 1978
 Buku Teks
Foley, Gerald, author
The energy question
Penguin Books, 1976
 Buku Teks
Ziglar, Zig, author
Steps to the top
Heinemann Asia, 1995
 Buku Teks
tevis, Walter
The Steps of the sun
Doubleday, , 1983
 Buku Teks
Walker, Peter, author
In the steps of Jesus
Kanisius, 2010
 Buku Referensi
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