APA
hewitt s., . (1995). Maths Puzzles. london: evans brothers limited.
Chicago
hewitt sally, . 1995. Maths Puzzles. london: evans brothers limited.
Harvard
hewitt s., . (1995). Maths Puzzles. london: evans brothers limited.
MLA
hewitt sally, . Maths Puzzles. london: evans brothers limited. 1995.