Andrew, Val. Manual of Balloon Modeling, Vol. 1, An Encyclopedic Series 1981, Magico Magazine, NYC quoted on Balloon HistoryАрхивная копия от 5 февраля 2015 на Wayback Machine BalloonHQ. Accessed 10/5/07
Andrew, Val. Manual of Balloon Modeling, Vol. 1, An Encyclopedic Series 1981, Magico Magazine, NYC quoted on Balloon HistoryАрхивная копия от 5 февраля 2015 на Wayback Machine BalloonHQ. Accessed 10/5/07