Byrne, J., & Waugh, A. (1980). Zig Zag: An activity course for children. Reading Book Year 2. Oxford University Press.

Byrne, John, and Anne Waugh. Zig Zag: An Activity Course for Children. Reading Book Year 2. Oxford: Oxford University Press, 1980.

Byrne, John, and Anne Waugh. Zig Zag: An Activity Course for Children. Reading Book Year 2. Oxford University Press, 1980.