Wurtzel talks about working as assistant director on the Bel-Air horror flicks "The Black Sleep" (1956), "Voodoo Island" (1957) and "Pharaoh's Curse" (1957) in the book "A Sci-Fi Swarm and Horror Horde" (McFarland, 2010) by Tom Weaver.
Wurtzel reminisces about assistant-directing Bel-Air Westerns of the 1950s in the book "Wild Wild Westerners" by Tom Weaver (BearManor, 2012).