references

 

- Th. J.J.Ram, Psychologische Astrologie, second edition, published by H.J.W. Becht, Amsterdam, the Netherlands

 

- Ir. C.J.Snijders, Beginselen der Astrologie, published by J.W.Becht, Amsterdam, the Netherlands, 1940

 

- A.E.Thierens, Elementen der Esoterische Astrologie, published by Schors, Amsterdam, the Netherlands, isbn:90 6378 039-7

 

- A.E. Thierens, Cosmologie, Elementen der Practische Astrologie, published by Schors, Amsterdam, the Netherlands

 

list of references

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