His Quality customer service, c1987: t.p. (William B. Martin) p. 4 of cover (William Martin, Ph.D., asso. prof. of hotel, restaurant & travel management at Calif. State Polytechnic Univ., Pomona)

Biblioteca del congreso (Estados Unidos), 20 febrero de 2018: catálogo electrónico https://goo.gl/9knKvo