Gaya APA

Silva, K, T, D. (1995). A MANUAL ON THE ESSENTIAL OIL INDUSTRY . Austria: UNITED NATIONS INDUTRIAL DEVELOPMNT ORGANIZATION.

Gaya MLA

Silva, K., Tuley, De. "A MANUAL ON THE ESSENTIAL OIL INDUSTRY". Austria: UNITED NATIONS INDUTRIAL DEVELOPMNT ORGANIZATION, 1995. Text.