Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page VisiCalc:

This text is part of the article's lead section, so referencing it may be optional. Please see WP:CITELEAD for more information.

"

Initially developed for the Apple II computer using a 6502 assembler running on the Multics time-sharing system,[7][8][9] VisiCalc was ported to numerous platforms, both 8-bit and some of the early 16-bit systems. To do this, the company developed porting platforms that produced bug compatible versions. The company took the same approach when the IBM PC was launched, producing a product that was essentially identical to the original 8-bit Apple II version. Sales were initially brisk, with about 300,000 copies sold.[citation needed]