Seifert, H., & Threlfall, W. (1959). Variations rechnung in grossen.
Chicago Edition CitationSeifert, H., and W. Threlfall. Variations Rechnung in Grossen. 1959.
MLA Edition CitationSeifert, H., and W. Threlfall. Variations Rechnung in Grossen. 1959.
Warning: These citations may not always be 100% accurate.