MLA

Bonilla, Jean de, 16th cent, Geronimo de Ferrara, Peter, of Alcantara, Saint, 1499-1562, T. W., Esq. Pax animi : a short treatise declaring how neccesary the tranquility and peace of the mind is, and how it may be obtained / written in Spanish, by the V.R.F. Fray Pedro de Alcantara ... ; and translated into English by T.W. esq. .... 1665. https://collections.library.yale.edu/catalog/2057411.

APA, 6th edition

Bonilla, Jean de, 16th cent, & Geronimo de Ferrara, & Peter, of Alcantara, Saint, 1499-1562, & T. W., Esq. (1665)[Pax animi : a short treatise declaring how neccesary the tranquility and peace of the mind is, and how it may be obtained / written in Spanish, by the V.R.F. Fray Pedro de Alcantara ... ; and translated into English by T.W. esq. ...]. https://collections.library.yale.edu/catalog/2057411.