Solow, Herbert F.;Solow, Yvonne Fern. The Star Trek Sketchbook: The Original Series.Pocket Books, a division of Simon & Schuster, Inc.,1997,p.238– 239. ISBN 0-671-00219-8.«Wah was working as a partner in the special effects and design firm Projects Unlimited during the production of the first Star Trek pilot, "The Cage." Thereafter, Wah dissolved his relationship with Projects Unlimited and worked independently from his home studio in Altadena, California. He soon became the "phantom" supplier of most of Star Trek's alien beings and hand props.»
Solow, Herbert;Justman, Robert. Inside Star Trek: The Real Story.Pocket Books, a division of Simon & Schuster, Inc.,1996,p.118– 119. ISBN 0-671-89628-8.«I struck a deal and gave them Matt's detailed working drawings, and they departed, with Wah already planning how he would execute Matt's phaser pistol design, in addition to building the other two props. He finished everything perfectly and made several beautiful hero models of all three props, and all the dummy mockups that I knew the show would require.»
