Παραπομπή APA

Birtwistle, C. (1971). Mathematical puzzles and perplexities: How to make the most of them. London: Allen and Unwin.

Παραπομπή Chicago Style

Birtwistle, Claude. Mathematical Puzzles and Perplexities: How to Make the Most of Them. London: Allen and Unwin, 1971.

Παραπομπή MLA

Birtwistle, Claude. Mathematical Puzzles and Perplexities: How to Make the Most of Them. London: Allen and Unwin, 1971.

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