Cita APA (7th ed.)

Looijenga, E., Siersma, D., & Takens, F. (1981). Geometry symposium, Utrecht 1980. Springer-Verlag.

Cita Chicago (17th ed.)

Looijenga, E., D. Siersma, i F. Takens. Geometry Symposium, Utrecht 1980. Berlín: Springer-Verlag, 1981.

Cita MLA (9th ed.)

Looijenga, E., et al. Geometry Symposium, Utrecht 1980. Springer-Verlag, 1981.