by Colin McEwan ... [et al.] ; by Galen Gruman ... [et al.]. by Colin Barrow ... [et al.] by Irving Rein ... [et al.]. by Anis Koubaa ... [et al.]. by Julia Twigg ... [et al.]. by Helen Palmer ... [et al.]. by Gillian Lockwood ... [et al.]. by Dr. Seuss ... [et al.]. by P.D. Eastman ... [et al.]