Cause of the expression ...
MLA
Dalrymple, Louis, 1866-1905. Cause of the expression .... 1899 October 4. https://collections.library.yale.edu/catalog/2057799.
APA, 6th edition
Dalrymple, Louis, 1866-1905. (1899 October 4)[Cause of the expression ...]. https://collections.library.yale.edu/catalog/2057799.