Steele, J. M. (2011). Goal-Year Periods and Their Use in Predicting Planetary Phenomena.
Chicago-Zitierstil (17. Ausg.)Steele, John M. Goal-Year Periods and Their Use in Predicting Planetary Phenomena. 2011.
MLA-Zitierstil (8. Ausg.)Steele, John M. Goal-Year Periods and Their Use in Predicting Planetary Phenomena. 2011.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.