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1. Apuntes Lenguaje Java - Packages
11.1 Claúsula package. Un package es una agrupación de clases afines. Equivale al concepto de librería existente en otros lenguajes o sistemas.
http://www.arrakis.es/~abelp/ApuntesJava/Packages.htm
2. Java package - Wikipedia, the free encyclopedia
A Java package is a mechanism for organizing Java classes into namespaces similar to the modules of Modula. Java packages can be stored in compressed files called JAR files ...
http://en.wikipedia.org/wiki/Java_package
3. Lesson: Packages (The Java™ Tutorials > Learning the Java Language)
This beginner Java tutorial describes fundamentals of programming in the Java programming language
http://download.oracle.com/javase/tutorial/java/package/index.html