Pierson, R. H. (1976). Good-bye planet earth. Pacific Press.
Cita Chicago (17th ed.)Pierson, Roberto H. Good-bye Planet Earth. Pacific Press, 1976.
Cita MLA (9th ed.)Pierson, Roberto H. Good-bye Planet Earth. Pacific Press, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.