por Crosby, Philip B [autor] | Diaz Grcia De Leon, Octavio [traductor] | Crosby, Philip B. Quality is free.
por Crosby, Philip B [autor] | García Mendoza, Alberto [traductor] | Crosby, Philip B. Quality without tears.
por Crosby, Philip B [autor] | Meza Staines, Guadalupe [traductor].
por Crosby, Philip B [autor].