Cita APA (7a ed.)

Roberts-Phelps, G. (1998). 50 brain-teasers: For meetings, presentations and training sessions. Gower.

Cita Chicago Style (17a ed.)

Roberts-Phelps, Graham. 50 Brain-teasers: For Meetings, Presentations and Training Sessions. Aldershot [etc.]: Gower, 1998.

Cita MLA (9a ed.)

Roberts-Phelps, Graham. 50 Brain-teasers: For Meetings, Presentations and Training Sessions. Gower, 1998.