Cita APA (7th ed.)

Instone, I. (1988). The teaching of problem-solving. Longman.

Cita Chicago (17th ed.)

Instone, Ian. The Teaching of Problem-solving. [S.l.]: Longman, 1988.

Cita MLA (9th ed.)

Instone, Ian. The Teaching of Problem-solving. Longman, 1988.