APA (7th ed.) Citation

Neuhold, E. J., & Lawson, H. W. (1971). The PL/I machine: An introduction to programming. Addison-Wesley.

Chicago Style (17th ed.) Citation

Neuhold, Erich J., and Harold W. Lawson. The PL/I Machine: An Introduction to Programming. Reading, Massachusetts [etc.]: Addison-Wesley, 1971.

MLA (9th ed.) Citation

Neuhold, Erich J., and Harold W. Lawson. The PL/I Machine: An Introduction to Programming. Addison-Wesley, 1971.