The problem of substitution

MLA

Hearn, A. C. “The Problem of Substitution.” IBM PROC. OF THE 1968 SUMMER INST. ON SYMBOLIC MATHEMATICAL COMPUTATION JUN. 1969, June 1969. EBSCOhost, widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edsnas&AN=edsnas.19710009711&authtype=sso&custid=ns315887.

APA

Hearn, A. C. (1969). The problem of substitution. IBM PROC. OF THE 1968 SUMMER INST. ON SYMBOLIC MATHEMATICAL COMPUTATION JUN. 1969.

Chicago

Hearn, A. C. 1969. “The Problem of Substitution.” IBM PROC. OF THE 1968 SUMMER INST. ON SYMBOLIC MATHEMATICAL COMPUTATION JUN. 1969, June. http://widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=edsnas&AN=edsnas.19710009711&authtype=sso&custid=ns315887.