| GMD | Text |
| Classification | 500 C144 v.2 |
| Publisher | Cambridge, Cambridge University Press, c1984 |
| Subject | Communication -- Juvenile literature.Communication - For children. |
| Series | Cambridge science universe |
| Description | 8 v. : ill. ; 30 cm. |
| ISBN | 9780521259989 |
| Additional ISBN | 0521259983 |