Warwicum, Northamtonia, Huntingdonia, Cantabrigia, Suffolcia, Oxonium, Buckinghamia, Bedfordia, Hartfordia, Essexia, Berceria, Middelsexia, Southa[m]tonia, Surria, Cantiu[m] & Southsexia

Chicago citation style
Mercator, Gerhard, 1512-1594. Warwicum, Northamtonia, Huntingdonia, Cantabrigia, Suffolcia, Oxonium, Buckinghamia, Bedfordia, Hartfordia, Essexia, Berceria, Middelsexia, Southa[m]tonia, Surria, Cantiu[m] & Southsexia. 1628. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/6w924q63h. (Accessed July 16, 2018.)
APA citation style
Mercator, Gerhard, 1512-1594, (1628) Warwicum, Northamtonia, Huntingdonia, Cantabrigia, Suffolcia, Oxonium, Buckinghamia, Bedfordia, Hartfordia, Essexia, Berceria, Middelsexia, Southa[m]tonia, Surria, Cantiu[m] & Southsexia. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/6w924q63h
MLA citation style
Mercator, Gerhard, 1512-1594. Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/6w924q63h>.
Note: These citations are programmatically generated and may be incomplete.