APA (7th ed.) Citation

Henson, M. A. (1953). Sun spots, comets, and calamities. s.n.

Chicago Style (17th ed.) Citation

Henson, Mariano A. Sun Spots, Comets, and Calamities. [Angeles, Pampanga: s.n, 1953.

MLA (9th ed.) Citation

Henson, Mariano A. Sun Spots, Comets, and Calamities. s.n, 1953.