Cita APA (7a ed.)

Lewis, M., & Kelly, G. (1986). 20 activities for developing managerial effectiveness: A management skills training manual. Gower.

Cita Chicago Style (17a ed.)

Lewis, Mike, y Graham Kelly. 20 Activities for Developing Managerial Effectiveness: A Management Skills Training Manual. Aldershot,England: Gower, 1986.

Cita MLA (9a ed.)

Lewis, Mike, y Graham Kelly. 20 Activities for Developing Managerial Effectiveness: A Management Skills Training Manual. Gower, 1986.