Beers' almanac for the year of our Lord 1820 ..
MLA
Beers, Andrew. Beers' Almanac for the Year of Our Lord 1820 .. Hartford [Conn.]: Printed by George Goodwin and Sons, 1819
APA, 7th edition
Beers, A. (1819). Beers' almanac for the year of our Lord 1820 .. Hartford [Conn.]: Printed by George Goodwin and Sons
Chicago, 17th edition
Beers, Andrew. Beers' almanac for the year of our Lord 1820 .. Hartford [Conn.]: Printed by George Goodwin and Sons, 1819