When writing papers, there are many guides to proper citation of an article. The articles that appear in Google Scholar actually appear in a journal or conference proceeding, and the form of citation is the same as though you had found the article searching through the print publication. The fact that you found the article or abstract searching through Google Scholar should no make no difference. For instance, you would not cite Google Scholar as the source of the information, but instead the journal in which the article will or has appeared.
Citing articles that appear on the Internet and not as part of published hardcopy journal is done differently. There are many guides to proper citation of Internet articles. Here are a few:
Columbia University Press
www.columbia.edu/cu/cup/cgos/idx_basic.html
International Federation of Library Associations and Institutions
www.ifla.org/I/training/citation/citing.htm
Modern Language Association Style Guide
www.mla.org