Curran, R. (1997). The little gray cloud. Venture Books.
Cita Chicago (17th ed.)Curran, Ron. The Little Gray Cloud. Irvine, CA: Venture Books, 1997.
Cita MLA (9th ed.)Curran, Ron. The Little Gray Cloud. Venture Books, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.