Cita APA (7a ed.)

Watson, T., & Quinn, T. (1969). Making sure of maths. Holmes McDougall.

Cita Chicago Style (17a ed.)

Watson, T.F, y T.A Quinn. Making Sure of Maths. Holmes McDougall, 1969.

Cita MLA (8a ed.)

Watson, T.F, y T.A Quinn. Making Sure of Maths. Holmes McDougall, 1969.