Smalltalk-80: The Language and Its Implementation (with David Robson[?]), Addison-Wesley, 1983, ISBN 0-201-11371-6 (out of print; known as the "blue book" to Smalltalk people)
Smalltalk-80: the Interactive Programming Environment, Addison-Wesley, 1984, ISBN 0-201-11372-4 (the "orange book")
Smalltalk-80: The Language (with David Robson), Addison-Wesley, 1989, ISBN 0-201-13688-0 (the "purple book" - a revision of the "blue book")
... Halle and Heidelberg, devoting himself mainly to the doctrines of Hegel and Schleiermacher. After holding the chair of philosophy at Halle for two years, he became, in 1833, ...