Boyd, Martin, author
A difficult young man
Lansdowne Press, 1974
 Buku Teks
Lundin, William, 1923- , author
Working with difficult people
American Management Association, 2009
 eBooks
Hutchinson dictionary of difficult words
edited by John Ayto
Helicon, 1994
 Buku Referensi
Kishawy, Hossam A., author
Machining Difficult-to-Cut Materials
Springer Cham, 2019
 eBooks
Boyd, Martin, author
A difficult young man
Lansdowne Press, 1974
 Buku Teks
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