por Decker, Robert W. (Robert Wayne), 1927- [autor] | Decker, Barbara, 1929- [autor] | University of Cambridge.
por Decker, Robert W. (Robert Wayne), 1927- [autor] | Decker, Barbara, 1929- [autor] | Hazlett, Rick [ilustrador].
por Decker, Robert W. (Robert Wayne), 1927- [autor] | Decker, Barbara, 1929- [autor].