Cita APA (7a ed.)

Hill, I. D., & Hill, P. A. (1968). Random times for activity sampling: 12 hour & 24 hour tables. Institute of Work Study Practitioners.

Cita Chicago Style (17a ed.)

Hill, Ian David, y Peter A. Hill. Random Times for Activity Sampling: 12 Hour & 24 Hour Tables. Enfield: Institute of Work Study Practitioners, 1968.

Cita MLA (9a ed.)

Hill, Ian David, y Peter A. Hill. Random Times for Activity Sampling: 12 Hour & 24 Hour Tables. Institute of Work Study Practitioners, 1968.