APA (7th ed.) Citation

Covey. (1990). Principle - centred leadership. Simon & Schuster UK Ltd.

Chicago Style (17th ed.) Citation

Covey. Principle - Centred Leadership. London: Simon & Schuster UK Ltd, 1990.

MLA (8th ed.) Citation

Covey. Principle - Centred Leadership. Simon & Schuster UK Ltd, 1990.

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