Rhetorices elementa quæstionibus et responsionibus explicata: quæ ita formantur, ut quæstionibus prorsus omissis, vel neglectis, responsiones solummodò integram rhetorices institutionem Tironibus exhibeant. Per Guil. Du-Gard. In usum scholæ mercatorum-scissorum - Dugard, William 1606-1662 (typis autoris, 1660)
Reproduction of original in the University of Illinois (Urbana-Champaign Campus). Library. - Wing (CD-ROM, 1996), D2470aA