LEDA Extension Packages: Data types and algorithms (number types and linear algebra, basic data types, dictionaries, graphs, geometry, graphics).
Leda Programming Language: Multiparadigm language, by Timothy Budd, creator of Little Smalltalk, Oregon State University. Combines procedural (imperative), object-oriented, logic, and functional programming, in one coherent, unified system.
Multiparadigm Programming in Leda: By Timothy Budd; Addison-Wesley, 1994, ISBN 0201820803. First book on such programming. Many short chapters, easy to read, shows how unique features of each paradigm can be learned and applied concurrently via one tool. [Amazon.com]
