Gaya APA

Ogg, J, G. et al (2012). The Geologic Time Scale 2012: volume 1 (1st Ed. Vol. 1). Amsterdam: .

Gaya MLA

Ogg, James, G.. et al. "The Geologic Time Scale 2012: volume 1". 1st Ed. Vol. 1 Amsterdam: , 2012. print.