Gaya APA

L., F, F., Swanson, C, P. (1964). **Our planet resources plants and economic importance . New York: New York: Holt, Rinehart and Winston; 1964..

Gaya MLA

L., Fitzpatrick., Frederick., Swanson, Carl, P.. "**Our planet resources plants and economic importance". New York: New York: Holt, Rinehart and Winston; 1964., 1964. Text.