Cita APA (7th ed.)

Armstrong, W. A. (1971). Sean O'Casey. Published for the British Council by Longmen.

Cita Chicago (17th ed.)

Armstrong, William A. Sean O'Casey. Harlow, Essex, Eng: Published for the British Council by Longmen, 1971.

Cita MLA (9th ed.)

Armstrong, William A. Sean O'Casey. Published for the British Council by Longmen, 1971.