Encyclopedia of Environmental Ethics and Philosophy
J. Baird Callicott & Robert Frodeman
The Mathematica® Book
Stephen Wolfram
Unsere Erde 9./10. Schuljahr. Schülerbuch Gymnasium Thüringen
Martina Flath & Joan Fugel & Denny Jahn & Rolf Maroske & Ellen Rudyk & Ute Mathesius-Wendt & Ingmar Oehme & Matthias Stober
Israel and South Africa
Desconhecido
A Dictionary of Alchemical Imagery
Lyndy Abraham
CRC Concise Encyclopedia of Mathematics, Second Edition
Eric W. Weisstein