THE ASTRONOMICAL .... (1999). The Astronomical almanak for the year 2000: Data forastronomy, apace sciences, geodesy, suveying, ... U.S. Goverment Printing Offece.
芝加哥风格引文THE ASTRONOMICAL .... The Astronomical Almanak for the Year 2000: Data Forastronomy, Apace Sciences, Geodesy, Suveying, ... Washington: U.S. Goverment Printing Offece, 1999.
MLA引文THE ASTRONOMICAL .... The Astronomical Almanak for the Year 2000: Data Forastronomy, Apace Sciences, Geodesy, Suveying, ... U.S. Goverment Printing Offece, 1999.
警告：这些引文格式不一定是100％准确.