APA (7th ed.) Citation

Lipsius, J. (1621). De constantia libri duo.

Chicago Style (17th ed.) Citation

Lipsius, Justus. De Constantia Libri Duo. Witeberga, 1621.

MLA (9th ed.) Citation

Lipsius, Justus. De Constantia Libri Duo. 1621.

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