APA (7th ed.) Citation

ENNEN, R. C. (1987). The Early History of the "Gradus ad Parnassum". Archivum historicum Societatis Iesu, 56, 233-266.

Chicago Style (17th ed.) Citation

ENNEN, Robert Campion. "The Early History of the "Gradus Ad Parnassum"." Archivum Historicum Societatis Iesu 56 (1987): 233-266.

MLA (9th ed.) Citation

ENNEN, Robert Campion. "The Early History of the "Gradus Ad Parnassum"." Archivum Historicum Societatis Iesu, vol. 56, 1987, pp. 233-266.

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