Howard, W. (1968). Nine roads to renewal. Woldbooks.
Cita Chicago (17th ed.)Howard, Walden. Nine Roads to Renewal. Woldbooks, 1968.
Cita MLA (9th ed.)Howard, Walden. Nine Roads to Renewal. Woldbooks, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.