Roma Aeterna incorporates the following features:
* The main books in the Lingua Latin per se Illustrata series, Familia Romana (Pars I) and Roma Aeterna (Pars II) are entirely in Latin. Additional student guides for the series are also available from Hackett Publishing Company / Focus, including Hans H. Ørberg's Instructions, a student guide in English for Roma Aeterna, and Jeanne Marie Neumann's A Companion to Roma Aeterna. Companion offers a running commentary, in English, of the Latin grammar covered in Roma Aeterna and includes the complete text of the Ørberg ancillaries Grammatica Latina and Latin–English Vocabulary II. It also serves as a substitute for Ørberg's Instructions, on which it is based.