Treatises Attributed to Cyprian on Questionable Authority  
   On the Spectacles; On the Glory of Martyrdom; On the Discipline and Good of Chastity; Exhortation to Repentance. Probably not written by St. Cyprian of Carthage, but if you want to read them, use the "TOC" link at the top of this page.
   http://www.ccel.org/fathers2/ANF-05/anf05-126.htm

To Donatus  
   On the sordidness of pagan society, and the power of baptism to regenerate.
   http://www.churchdocs.org/fathers/cyprian/cyp-dona.txt

The Epistles of Cyprian  
   Ernest Wallis translation. From Ante-Nicene Fathers (American edition), vol. 5. In HTML, with notes, at Christian Classics Ethereal Library. Each letter has its own file.
   http://www.ccel.org/fathers2/ANF-05/anf05-26.htm

Testimonies Against the Jews  
   In three books Cyprian endeavors to show that Jews had lost God's favor, profiles the lineaments of the Christian faith, and sets out a number of religious precepts.
   http://www.ccel.org/fathers2/ANF-05/anf05-122.htm

The Epistles of Cyprian- Volume I  
   Letters 1 to 53 of Cyprian's correspondence collected in a single file, including messages from the Roman clergy, the Carthaginian presbyters, bishop Cornelius, and the confessors.
   http://apostlesrec.com/wilderness/cyprian/proofs/LettersVol1.htm

The Epistles of Cyprian- Volume II  
   Letters 54 to 82 of Cyprian's correspondence collected in a single file, including messages from Firmilian, bishop of Caesarea in Cappadocia, the martyrs in the mines, and other confessors in prison.
   http://apostlesrec.com/wilderness/cyprian/proofs/LettersVol2.htm