Here are examples of references in APA style for different sources:
Books
Surname, Initial(s). (Year). Title of book. Location: Publisher.
Journals
Surname, Initial(s). (Year). Article title. Journal Name, Volume(Issue), page range.
Newspaper articles
Surname, Initial(s). (Year, Month Date). Article title. Newspaper, page range.
Financial reports
Company Name. (Year). Title of report. Retrieved from http://www.companyname.com/
Historical records
Author, Initial(s). (Year). Title of document. Retrieved from Name of archive or library database.