APA (7th ed.) Citation

Sichel, F. H. (1975). Challenge of the past. Selbstverlag d. Verf.

Chicago Style (17th ed.) Citation

Sichel, Frieda H. Challenge of the Past. Johannisburg: Selbstverlag d. Verf, 1975.

MLA (8th ed.) Citation

Sichel, Frieda H. Challenge of the Past. Selbstverlag d. Verf, 1975.

Warning: These citations may not always be 100% accurate.