The Complete Lojban Language is a complete description of the artificial
language Lojban. It serves as a reference grammar for the language, offering an overview of the language, as well as linguistic details on every aspect of the language. This book serves as the standard defining the language design. That design has been declared frozen (under a baseline) for a minimum 5 year period; anyone who learns the language from this book can be assured that it will not be continually changing.
'An online draft version is available at http://lojban.org/publications/reference_grammar.html'''
If you'd like to order it, the ISBN number 0-9660283-0-9, the author is John Woldemar Cowan, and the publisher is The Logical Language Group.
It is a nice red hard cover book with gold lettering on the cover. It is 620 pages long and includes a complete, though not pleasant to look at index. The suggested retail price is US$48. You can get it from amazon.com via this link.
The Logical Language Group also sells the book. Please consider making a donation when you purchase the book, in order to help defray the costs of publication.
It is only fair to note that the turn-around time for this book from the LLG has been seen to exceed four months.
The Complete Lojban Language is also jocularly known as the Codex Woldemar (or Woldy for short), and more formally as the reference grammar or refgramm, or CLL.
A list of BookErrata is available, most of which have been approved by the book's author.
The CLL is the textual Sistine Chapel of modern conlang books.