For all of your assignments, you must cite and provide full references for all sources you have consulted. This means you must acknowledge any ideas, facts, opinions etc. of others if they are directly quoted, paraphrased, or summarized in your work. By citing your sources, you are not only giving credit to the work of others, you are helping to build knowledge by sharing with those who read your work the source of the evidence and ideas that have informed your understanding of the topic. Not citing and referencing your work properly can be construed as plagiarism, a form of academic dishonesty.
You will "cite" the work you have consulted at the place in your assignment where the fact or idea you have used appears. You are also required to include a reference list, a complete list of all sources you have used, at the end of the paper. APA is the output style most used in the Social Sciences, including Business.
Plagiarism 101 (accessed November 28/16) says:
...to "plagiarize" means:
In other words, plagiarism is an act of fraud. It involves both stealing someone else's work and lying about it.