Spain and Portugal, from the best authorities
MLA
Guthrie, William, and Mathew Carey. Spain and Portugal, From the Best Authorities. [Philadelphia]: [Mathew Carey], [7950?]
APA, 7th edition
Guthrie, W., & Carey, M. ([7950?]). Spain and Portugal, from the best authorities. [Philadelphia]: [Mathew Carey]
Chicago, 17th edition
Guthrie, William, and Mathew Carey. Spain and Portugal, from the best authorities. [Philadelphia]: [Mathew Carey], [7950?]