Opera omnia,

MLA

Thomas, and Leo. Opera Omnia. Romae,: Ex Typographia Polyglotta S.C. de Propaganda Fide, 1887.

APA

Thomas, T., & Leo, L. (1887). Opera omnia. Romae,: Ex Typographia Polyglotta S.C. de Propaganda Fide.

Chicago

Thomas, and Leo. Opera Omnia,. Romae,: Ex Typographia Polyglotta S.C. de Propaganda Fide, 1887.