Cita APA (7a ed.)

Duce, D. A., & Hopgood, F. (1991). EUROGRAPHICS'91: : Essential PHIGS and a View of PHIGS PLUS. Viena, Austria, 2-6 September (1991. Viena, Austria). Eurographics.

Cita Chicago Style (17a ed.)

Duce, David A., y F.R.A Hopgood. EUROGRAPHICS'91: : Essential PHIGS and a View of PHIGS PLUS. Viena, Austria, 2-6 September (1991. Viena, Austria). Vienna: Eurographics, 1991.

Cita MLA (9a ed.)

Duce, David A., y F.R.A Hopgood. EUROGRAPHICS'91: : Essential PHIGS and a View of PHIGS PLUS. Viena, Austria, 2-6 September (1991. Viena, Austria). Eurographics, 1991.