Cita APA (7th ed.)

Beyer, H., & Holtzblatt, K. (1998). Contextual design: Defining customer-centered systems. Morgan Kaufmann.

Cita Chicago (17th ed.)

Beyer, Hugh, i Karen Holtzblatt. Contextual Design: Defining Customer-centered Systems. San Francisco, California: Morgan Kaufmann, 1998.

Cita MLA (9th ed.)

Beyer, Hugh, i Karen Holtzblatt. Contextual Design: Defining Customer-centered Systems. Morgan Kaufmann, 1998.