APA (7th ed.) Citation

A portfolio of maps - the United States by countries: Initial potential summaries.

Chicago Style (17th ed.) Citation

A Portfolio of Maps - the United States by Countries: Initial Potential Summaries. [Denver, Colo.].

MLA (9th ed.) Citation

A Portfolio of Maps - the United States by Countries: Initial Potential Summaries.

Warning: These citations may not always be 100% accurate.