APA (7th ed.) Citation

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..

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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