Cita APA (7th ed.)

Ward, S. M., Freeman, R. S., & Nixon, J. M. (2016). Academic e-books: Publishers, librarians, and users. Purdue University Press.

Cita Chicago (17th ed.)

Ward, Suzanne M., Robert S. Freeman, i Judith M. Nixon. Academic E-books: Publishers, Librarians, and Users. West Lafayette, Indiana: Purdue University Press, 2016.

Cita MLA (9th ed.)

Ward, Suzanne M., et al. Academic E-books: Publishers, Librarians, and Users. Purdue University Press, 2016.