Presence: Where Are We Now? - Michael J. Singer; Bob G. Witmer (HCI (2), 1997)

Measuring Presence in Virtual Environments: A Presence Questionnaire. - Bob G. Witmer; Michael J. Singer (Presence Teleoperators Virtual Environ., 1998)

On Selecting the Right Yardstick. - Michael J. Singer; Bob G. Witmer (Presence Teleoperators Virtual Environ., 1999)

The Factor Structure of the Presence Questionnaire. - Bob G. Witmer; Christian J. Jerome; Michael J. Singer (Presence Teleoperators Virtual Environ., 2005)

Virtual environment cultural training for operational readiness (VECTOR). - John E. Deaton; Charles Barba; Thomas Santarelli; Larry Rosenzweig; Vance Souders; Chris McCollum; Jason Seip; Bruce W. Knerr; Michael J. Singer (Virtual Real., 2005)