Jess, Z. (1806). The American tutor's assistant revised, or, A compendious system of practical arithmetic: Containing the several rules of that useful science, concisely defined, methodically arranged, and fully exemplified : the whole particularly adapted to the easy and regular instruction of youth in our American schools : originally comp. by sundry teachers in and near Philadelphia : now rev., and an additional number of examples given in money of the United States : to which is added, a course of bookkeeping by single entry. Philadelphia: Printed and sold by James Crukshank.

Jess, Zachariah. The American Tutor's Assistant Revised, Or, A Compendious System of Practical Arithmetic: Containing the Several Rules of That Useful Science, Concisely Defined, Methodically Arranged, and Fully Exemplified : The Whole Particularly Adapted to the Easy and Regular Instruction of Youth in Our American Schools : Originally Comp. By Sundry Teachers in and Near Philadelphia : Now Rev., and an Additional Number of Examples Given in Money of the United States : To Which Is Added, a Course of Bookkeeping By Single Entry. Philadelphia: Printed and sold by James Crukshank, 1806.

Jess, Zachariah. The American Tutor's Assistant Revised, Or, A Compendious System of Practical Arithmetic: Containing the Several Rules of That Useful Science, Concisely Defined, Methodically Arranged, and Fully Exemplified : The Whole Particularly Adapted to the Easy and Regular Instruction of Youth in Our American Schools : Originally Comp. By Sundry Teachers in and Near Philadelphia : Now Rev., and an Additional Number of Examples Given in Money of the United States : To Which Is Added, a Course of Bookkeeping By Single Entry. Philadelphia: Printed and sold by James Crukshank, 1806.