Silber, G. K. (1991). Geographic and seasonal distribution of the vaquita, Phocoena sinus. Universidad Nacional Autónoma de México.
Citazione stile Chigago Style (17a edizione)Silber, Gregory K. Geographic and Seasonal Distribution of the Vaquita, Phocoena Sinus. Universidad Nacional Autónoma de México, 1991.
Citatione MLA (9a ed.)Silber, Gregory K. Geographic and Seasonal Distribution of the Vaquita, Phocoena Sinus. Universidad Nacional Autónoma de México, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.