Brannan, R.W. A Concordance of the Pastoral Epistles Ordered By Semantic Domain. http://www.supakoo.com/rick/pastorals/indexes/louwconc.htm. [more detail]

Brannan, R.W. Vocabulary Notes on the Pastoral Epistles. http://www.supakoo.com/rick/pastorals/notes/default.htm. [more detail]

Carlson, Stephen C. Authorial Style in the New Testament. http://www.mindspring.com/~scarlson/greek/cluster.html. [more detail]

Misselbrook, Peter. Notes on the Pastoral Epistles. http://www.btinternet.com/%7eMisPar/GNotes/timtit.htm. [more detail]