By Day, Robert A..
Phoenix Oryx Press 1988 .
xi, 211 p. , Includes index. 24 cm..
089774456X

By Day, Robert A..
Washington, D.C. Organización Panamericana de la Salud 1996 .
xvi, 217 p. 9275315582 (pbk.)

By Day, Robert A..
Phoenix, Az. Oryx Press 1998 .
xvi, 275 p. 23 cm..
1573561649 (case : alk. paper) | 1573561657 (pbk. : alk. paper)

By Day, Robert A..
Santa Barbara, Calif. Greenwood 2011 .
xxi, 300 p. 25 cm..
9780313391958 (hardback) | 9780313391972 (pbk.) | 9780313391965 (ebook)