APA (7th ed.) Citation

Humphreys, K. (1988). A National Library in theory and in practice. The British Library Board.

Chicago Style (17th ed.) Citation

Humphreys, K.W. A National Library in Theory and in Practice. London: The British Library Board, 1988.

MLA (9th ed.) Citation

Humphreys, K.W. A National Library in Theory and in Practice. The British Library Board, 1988.