APA (7th ed.) Citation

Lock, N. D. Time tests: Short cuts to fractions. Ladybird Book Ltd.

Chicago Style (17th ed.) Citation

Lock, Norman D. Time Tests: Short Cuts to Fractions. London: Ladybird Book Ltd.

MLA (9th ed.) Citation

Lock, Norman D. Time Tests: Short Cuts to Fractions. Ladybird Book Ltd.

Warning: These citations may not always be 100% accurate.