APA (7th ed.) Citation

Heerkens, G. N. (1790). De valetudine litteratorum: Libri III. Vechner.

Chicago Style (17th ed.) Citation

Heerkens, Gerard Nicolaas. De Valetudine Litteratorum: Libri III. Groningae: Vechner, 1790.

MLA (9th ed.) Citation

Heerkens, Gerard Nicolaas. De Valetudine Litteratorum: Libri III. Vechner, 1790.

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