Recollections from late 80s and early 90s - from the recesses of my brain - Bianchi, Sparks, Bruce Nelson, Gordon Davis/later Galco training holster. For similar holsters these days it'd include Kramer, C Rusty Sherrick, Sparks/BNCL, and I imagine more.
One of the more books I've read lately is:
Published in '78. Really started to drive a holster mounting, carry, wear idea in my head.