Cita APA (7th ed.)

Wardle, M. (1972). From problem to program. William Clowes and Sons Limited.

Cita Chicago (17th ed.)

Wardle, M.E. From Problem to Program. Great Britain: William Clowes and Sons Limited, 1972.

Cita MLA (9th ed.)

Wardle, M.E. From Problem to Program. William Clowes and Sons Limited, 1972.