I'm not familiar with this book, but Mick Goodrick's Almanac of Guitar Voice-Leading Vol. II deals extensively with quartal harmony. You'll find page after page of 3-, 4-, and, 5-part chords in 4ths, voice-led through every possible permutation, for Major, Melodic Minor, and Harmonic Minor. I guess you wouldn't call that a "discussion", but it might be a great companion to the Persichetti.