Gaya APA

Melcalfe, H, C., E., I, W, J. (1986). Modern chemistry . USA: USA: Holt, Rinehart and Winston; 1986.

Gaya MLA

Melcalfe, H., Clark., E., I., Williams,, John. "Modern chemistry". USA: USA: Holt, Rinehart and Winston; 1986, 1986. Text.