MLA

Lewis, Barbara; Varey, Richard, et al. Internal Marketing: Directions for Management. Routledge, 2000.

APA

Lewis, R., Lewis, B. R, Varey, R. J, Richard Varey, R. Varey, & Varey, R. (2000). Internal Marketing: Directions for Management. Routledge.

Chicago

Lewis, Barbara; Varey, Richard, Barbara R Lewis, Richard J Varey, Richard Varey, and Richard Varey. Internal Marketing: Directions for Management. : Routledge, 2000.