Cita APA (7th ed.)

Goddard, T., & Grattidge, A. (1969). Beta mathemtics 1-4. Schofield & Sims.

Cita Chicago (17th ed.)

Goddard, T.T, i A.W Grattidge. Beta Mathemtics 1-4. Huddersfield: Schofield & Sims, 1969.

Cita MLA (9th ed.)

Goddard, T.T, i A.W Grattidge. Beta Mathemtics 1-4. Schofield & Sims, 1969.