MLA

J. Ottman Lithographic Company, Keppler & Schwarzmann, Pughe, J. S. (John S.), 1870-1909. Ready for business. 1899 May 31. https://collections.library.yale.edu/catalog/2066939.

APA, 6th edition

J. Ottman Lithographic Company, & Keppler & Schwarzmann, & Pughe, J. S. (John S.), 1870-1909. (1899 May 31)[Ready for business]. https://collections.library.yale.edu/catalog/2066939.