Article from a journal (including one found using the databases)
1. Goll JC, Shapiro CM. Sleep disorders presenting as common pediatric problems. Can Med Assoc J. 2006;174:617-19.
Article from an online-only journal
2. Lancee J, Spoormaker VI, Peterse G, Bout van den J. Measuring nightmare frequency: retrospective questionnaires versus prospective logs. Open Sleep J. 2008 [accessed 2014 Mar 2];26-8. http://www.bentham.org/open/toslpj/openaccess2.htm.
Give your in-text citations superscripted numbers and then list the references at the end in the order they appear in the text. If you repeat a source in-text, use the same number you first used.
Many behavioral problems in adolescents can be traced to an underlying sleep disorder.1 If your adolescent is having nightmares, have her keep a daily log of the frequency and intensity; these types of records are more useful than relying on memory should treatment become necessary.2 Sleep cycles are affected by puberty so teens are not able to fall asleep early in the evening.3 Disturbances in sleep habits can be an indicator of psychological problems in adolescents.4
References:
1. Goll JC, Shapiro CM. Sleep disorders presenting as common pediatric problems. Can Med Assoc J. 2006;174:617-19.
2. Lancee J, Spoormaker VI, Peterse G, Bout van den J. Measuring nightmare frequency: retrospective questionnaires versus prospective logs. Open Sleep J. 2008 [accessed 2014 Mar 2];26-8. http://www.bentham.org/open/toslpj/openaccess2.htm.
3. Owens JA. Sleep disorders. In: Behrman RE, Kliegman RM, Jenson HB, editors. Nelson textbook of pediatrics. 17th ed. Philadelphia: Saunders; 2004. p 75-80.
4. Stores G. A clinical guide to sleep disorders in children and adolescents. Cambridge: Cambridge University Press; 2001. 196 p.
To identify how specific words are abbreviated: http://www.ncbi.nlm.nih.gov/books/NBK7251/
To search for an abbreviation by journal name: http://www.ncbi.nlm.nih.gov/sites/entrez?db=journals
For example:
12. Smith EW, Vance ML, Bartel D, Joy E, Janus J, Qui W, Pa J, Hobbes C, Cant G, Kant W, et al. Avian flu in China. New Engl J Med. 2005; 372: 2275-82.