Britannica

Encyclopædia Britannica, Inc. is a leader in reference and education publishing whose products can be found in many media, from the Internet to cell phones to books.Britannica.com and student.britannica.com are the online versions of the highly regarded and globally respected encyclopedia. A pioneer in electronic publishing since the early 1980s, the company also still publishes the 32-volume Encyclopædia Britannica, along with other reputable products such as Britannica Student Encyclopædia, which are available online at http://store.britannica.com. Britannica's editorial operation is overseen by some of the world's most distinguished scholars. The company makes its headquarters in Chicago.

PLANETii

PLANETii: the fusion of creative ideas and technology in education PLANETii thrives on our ability to innovate in education. PLANETii strives to deliver our mathematics solutions to multiple countries, while maintaining a strong emphasis on personal choice. Building a solid foundation is the company's first priority, accomplished through personalization and globalization, and driven by a focus on quality at all levels. The company is always searching for ways to re-create children's learning experiences through the tight integration of content, design and technologies. Founded in 2000 by graduates of M.I.T. and Stanford University, PLANETii now has offices in the United States, Hong Kong, and China.