Experience with a Unix System-Administration Tool. - Raphael A. Finkel; Brian Sturgill; Harlan Stenn (Softw. Pract. Exp., 1999)

Securing the Network Time Protocol. - Harlan Stenn (ACM Queue, 2014)

Network Time Protocol Best Current Practices. - Denis Reilly 001; Harlan Stenn; Dieter Sibold (RFC, 2019)