Problem book | Activity books for children

(9781406379150) - Jory John - Walker Books and Subsidiaries - London, United Kingdom - Walker Books - Dimensions: 218 x 280 x 3mm | 175g - Edition: 1st paperback ed - Format: 32 pages - Height: 215 mm | Penguin Problems

(9780241183878) | Gives guidance

(9780241183861) | Problem solving

Springer (9780387982199) | Problem-Solving Strategies