(1993). Americans' Use of Time, 1985 John Robinson. [electronic resource].
Cita Chicago (17th ed.)Americans' Use of Time, 1985 John Robinson. [electronic Resource]. 1993.
Cita MLA (9th ed.)Americans' Use of Time, 1985 John Robinson. [electronic Resource]. 1993.
Atenció: Aquestes cites poden no estar 100% correctes.