The statesman's book of John of Salisbury :
being the fourth, fifth, and sixth books, and selections from the seventh and eighth books of the Policraticus /
translated into English with an introduction by John Dickinson.

APA Citation

John, o. Salisbury., Dickinson, J. (1927). The statesman's book of John of Salisbury: being the fourth, fifth, and sixth books, and selections from the seventh and eighth books of the Policraticus. New York: Knopf.

MLA Citation

John, of Salisbury, Bishop of Chartres, -1180, and John Dickinson. The Statesman's Book of John of Salisbury: Being the Fourth, Fifth, And Sixth Books, And Selections From the Seventh And Eighth Books of the Policraticus. New York: Knopf, 1927.

Warning: These citations may not always be complete (especially for serials).