APA (7th ed.) Citation

Higgins, J., & Higgins, M. (1987). Sequitur: A text sequencing tool. Research Design Associates, Inc..

Chicago Style (17th ed.) Citation

Higgins, John, and Muriel Higgins. Sequitur: A Text Sequencing Tool. Stony Brook, N.Y.: Research Design Associates, Inc., 1987.

MLA (9th ed.) Citation

Higgins, John, and Muriel Higgins. Sequitur: A Text Sequencing Tool. Research Design Associates, Inc., 1987.