Specer, D. (1970). Question wards. Longman Green.
Cita Chicago (17th ed.)Specer, D. Question Wards. London: Longman Green, 1970.
Cita MLA (9th ed.)Specer, D. Question Wards. Longman Green, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.