Cita APA (7th ed.)

Clarke , L. (1997). The essence of chnage. PHI.

Cita Chicago (17th ed.)

Clarke , Liz. The Essence of Chnage. New Delhi: PHI, 1997.

Cita MLA (9th ed.)

Clarke , Liz. The Essence of Chnage. PHI, 1997.