Apps, Jerold W., author
Improving practive in continuing education
Jossey-Bass , 1985
 Buku Teks
Improving university teaching
Yogyakarta : 1990,
 Buku Referensi
Humble, John William, author
Improving business results
McGraw-Hill, 1968
 Buku Teks
Humble, John William, author
Improving business results
Pan Books, 1972
 Buku Teks
Improving database usability and responsiveness
edited by Peter Scheuermann
Academic Press, 1982
 Buku Teks
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