Cita APA (7th ed.)

Houstis, E. N., Catlin, A. C., Rice, J. R., Verykios, V. S., Ramakrishnan, N., & Houstis, C. E. PYTHIA-II: A knowledge. ACM transactions on mathematical software..

Cita Chicago (17th ed.)

Houstis, Elias N., Ann C. Catlin, John R. Rice, Vassilios S. Verykios, Naren Ramakrishnan, i Catherine E. Houstis. "PYTHIA-II: A Knowledge." ACM Transactions on Mathematical Software. .

Cita MLA (9th ed.)

Houstis, Elias N., et al. "PYTHIA-II: A Knowledge." ACM Transactions on Mathematical Software., .