Core journals list - chemical abstracts service, Bibliographic information and abstracts for all articles in more than 1,500 key scientific journals are added to caplus sm within 7 days. the list below is sorted. Purdue owl: formatting style guide, Please note: there are no spaces used with brackets in apa. when possible, include the year, month, and date in references. if the month and date are not available. Apa style , Describes ways to get help with writing in apa style, including links to tutorials, the apa style blog, and other learning resources..