Most textbooks use Hepburn romanization (where shi is spelled shi and tsu is spelled tsu ). Jorden, however, developed her own system.

Japanese: The Spoken Language, Part 1 - A Question and Answer Supplement

, which is intended to reflect the language's structural logic rather than just English-based phonetics. Audio-First Learning

: Lists the main Part 1 textbook and the supplement. Prices for the supplement are typically around $24.00, while the main textbook can range from $30.00 to $60.00 depending on condition.

If you download the PDF expecting a colorful book filled with manga illustrations and "survival phrases" for ordering sushi, you will be surprised. is a serious, linguistic approach to acquisition.