APA (7th ed.) Citation

Abadilla, D. C. (1976). Comfrey: Nature's health food. s.n.].

Chicago Style (17th ed.) Citation

Abadilla, Domingo C. Comfrey: Nature's Health Food. [S.l: s.n.], 1976.

MLA (9th ed.) Citation

Abadilla, Domingo C. Comfrey: Nature's Health Food. s.n.], 1976.