APA (7th ed.) Citation

Hällström, G. G., & Ekmark, G. (1805). Comparatio Caloris In Foco Lentis Convexae Et Speculi Concavi.

Chicago Style (17th ed.) Citation

Hällström, Gustav Gabriel, and Gustavus Ekmark. Comparatio Caloris In Foco Lentis Convexae Et Speculi Concavi. Åbo, 1805.

MLA (9th ed.) Citation

Hällström, Gustav Gabriel, and Gustavus Ekmark. Comparatio Caloris In Foco Lentis Convexae Et Speculi Concavi. 1805.

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