Gaya APA

Watkins, R, , , , , , , , , , N. (1979). Petroleum Refinery Distillation (1979). : Houston: Gulf Publishing Co,.

Gaya MLA

Watkins, R, , , , , , , , , , N.. "Petroleum Refinery Distillation". 1979 : Houston: Gulf Publishing Co,, 1979. Text.