Cita APA (7a ed.)

Gurnsey, J., & White, M. S. (1989). Information consultancy. Clive Bingley.

Cita Chicago Style (17a ed.)

Gurnsey, John, y Martin S. White. Information Consultancy. London: Clive Bingley, 1989.

Cita MLA (9a ed.)

Gurnsey, John, y Martin S. White. Information Consultancy. Clive Bingley, 1989.