Alcos. (1681). The certain predictions of the great Alcos, astrologer and mathematician in ordinary to the Duke of Parma: Upon the two comets which have appeared in our hemisphere 1681. [publisher not identified].
Chicago Style (17th ed.) CitationAlcos. The Certain Predictions of the Great Alcos, Astrologer and Mathematician in Ordinary to the Duke of Parma: Upon the Two Comets Which Have Appeared in Our Hemisphere 1681. [London?]: [publisher not identified], 1681.
MLA (9th ed.) CitationAlcos. The Certain Predictions of the Great Alcos, Astrologer and Mathematician in Ordinary to the Duke of Parma: Upon the Two Comets Which Have Appeared in Our Hemisphere 1681. [publisher not identified], 1681.
Warning: These citations may not always be 100% accurate.