Patten, L. B. (1967). The ruthless range. Collins.
Cita Chicago (17th ed.)Patten, Lewis B. The Ruthless Range. London: Collins, 1967.
Cita MLA (8th ed.)Patten, Lewis B. The Ruthless Range. Collins, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.