Eiffel's Design by Contract: Predecessors and Original Contributions - By Bertrand Meyer. - http://www.ecs.syr.edu/faculty/fawcett/handouts/CSE784/F2001/Lecture6/ISE%20papers/Eiffel's%20Design%20by%20Contract%20Predecessors%20and%20Original%20Contributions%20(Bertrand%20Meyer-12%20Mar%2097).htm
An Invitation to Eiffel - On-line introduction to the Eiffel method and language. - http://archive.eiffel.com/doc/online/eiffel50/intro/language/
Eiffel: The Syntax - Describes the programming syntax in with links to the various sections. - http://www.gobosoft.com/eiffel/syntax/
Object-Oriented Style Rules - ISE's own style rules. - http://archive.eiffel.com/doc/manuals/language/style/
Eiffel: An Advanced Introduction - By Alan A. Snyder and Brian N. Vetter. - http://www.comp.ufla.br/~monserrat/eiffel/advanced_introduction/eiffel.html
ELKS 95: Table of contents - Eiffel Library Kernel Standard, as of 1995. - http://archive.eiffel.com/doc/manuals/library/elks/book.fm.html
Eiffel: The Reference (Working draft) - A very temporary draft of the current state of "Eiffel: The Reference". - http://archive.eiffel.com/nice/language/