Definition: reviews of this encyclopedia

Today, this content is only online; however, it began as a book in 1981 and was available in print for nearly 30 years in English and five foreign languages. For 20 years, the Windows version came on floppy disks and CD-ROMs and mobile apps were offered for more than a decade until websites became responsive and eliminated the need for multiple software versions.

We are happy to say that over the years, we have received hundreds of positive reviews for our content, a few of which follow: