APA (7th ed.) Citation

Leisenring, A. (1969). Mathematical logic and Hilbert's [capital sigma]-symbol. MacDonald Technical and Scientific.

Chicago Style (17th ed.) Citation

Leisenring, A.C. Mathematical Logic and Hilbert's [capital Sigma]-symbol. London: MacDonald Technical and Scientific, 1969.

MLA (9th ed.) Citation

Leisenring, A.C. Mathematical Logic and Hilbert's [capital Sigma]-symbol. MacDonald Technical and Scientific, 1969.

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