APA (7th ed.) Citation

Ellicott, A. The Pennsylvania, Delaware, Maryland, and Virginia almanack and ephemeris, for the year of our Lord, 1784: ... Calculated for the meridian of Baltimore-Town, lat. 39 deg. 30 min. north, and long. 4 hours and 59 min. west, from the observatory at Greenwich; but may, without sensible error, serve all the adjacent states.

Chicago Style (17th ed.) Citation

Ellicott, Andrew. The Pennsylvania, Delaware, Maryland, and Virginia Almanack and Ephemeris, for the Year of Our Lord, 1784: ... Calculated for the Meridian of Baltimore-Town, Lat. 39 Deg. 30 Min. North, and Long. 4 Hours and 59 Min. West, from the Observatory at Greenwich; but May, Without Sensible Error, Serve All the Adjacent States.

MLA (9th ed.) Citation

Ellicott, Andrew. The Pennsylvania, Delaware, Maryland, and Virginia Almanack and Ephemeris, for the Year of Our Lord, 1784: ... Calculated for the Meridian of Baltimore-Town, Lat. 39 Deg. 30 Min. North, and Long. 4 Hours and 59 Min. West, from the Observatory at Greenwich; but May, Without Sensible Error, Serve All the Adjacent States.