Cox George. The International Auxiliary Language

Project Gutenberg, 2011. — 220 pages.Esperanto is a constructed international auxiliary language. It is the most widely spoken constructed language in the world. An international auxiliary language (sometimes abbreviated as IAL or auxlang) or interlanguage is a language meant for communication between people from different nations who do not share a common first language. An auxiliary language is primarily a second language.This book provides a comprehensive and well-organized overview of the grammar with lots of examples and illustrations. It is easier to learn from than lessons, like most textbooks have. Since the time of its creation Esperanto hasn't changed enough. Sure, people are more like to say "esperantio" than "esperantujo".