Παραπομπή APA

Youngken, H. W. (2003). Natural drugs: Morphologic and taxonomic consideration (2nd ed.). Biotech books.

Παραπομπή Chicago Style

Youngken, Heber Wilkinson. Natural Drugs: Morphologic and Taxonomic Consideration. 2nd ed. Delhi: Biotech books, 2003.

Παραπομπή MLA

Youngken, Heber Wilkinson. Natural Drugs: Morphologic and Taxonomic Consideration. 2nd ed. Biotech books, 2003.