APA (7th ed.) Citation

Catholic Church. (1967). Graduale simplex: In usum minorum ecclesiarum. Typis polyglottis Vaticanis.

Chicago Style (17th ed.) Citation

Catholic Church. Graduale Simplex: In Usum Minorum Ecclesiarum. [Città del Vaticano]: Typis polyglottis Vaticanis, 1967.

MLA (8th ed.) Citation

Catholic Church. Graduale Simplex: In Usum Minorum Ecclesiarum. Typis polyglottis Vaticanis, 1967.

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