A citation for an article in ACS (American Chemical Society) format follows this model:
Last name, Initials; Last name, Initials (list each author). Journal title abbreviation in italics. publication year in bold, Volume number in italics provided (issue number in parentheses if provided), page numbers first - last.
Some articles are available in the ACS database and Scifinder before they have appeared in a journal issue. A database might indicate these articles with notes such as early access, or just accepted, or as soon as publishable. These articles may not a date, volume or issue numbers, or page numbers. To cite early access articles, use the term [online early access] in brackets instead of the missing information.
Examples:
Graulich, N.; Schween, M. J. Chem. Educ. [Online early access].
Mullin, R. Chem. Eng. News. 2005, 83 (42), 7.
Tresca, B.; Higbee, M.; Mills, N. S. J. Org. Chem. 2011, 76, 5539-5546.
For citations of non-journal sources, see ACS Style Quick Guide, available online and in the library (under call number QD8.5 A25 2006).