It is very important to reference ALL your sources because it answers these questions from your reader:
Where did you find your information?
What kind of source is it?
Where can I find the source myself?
What range of sources did you use?
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A bibliography is an alphabetical list of every source used to research and write the essay. Sources that are not cited in the body of the essay but were important in informing the approach taken should be cited in the introduction or in an acknowledgment. The bibliography must list only those sources cited.
A citation is a shorthand method of making a reference in the body of an essay, either as an in-text citation or footnote/endnote. This must then be linked to the full reference at the end of the essay in the bibliography. A citation provides the reader with accurate references so that he or she can locate the source easily. How sources are cited varies with the particular referencing style that has been chosen. It is important to emphasize that there must be consistency of method when citing sources.
A reference is a way of indicating to the reader, in an orderly form, where information has been obtained. A reference provides all the information needed to find the source material. References must be cited because:
References must be given whenever someone else’s work is quoted or summarized. References can come from many different sources, including books, magazines, journals, newspapers, emails, internet sites and interviews.
There are a number of different styles available for use when writing research papers; whatever style is chosen, it must be applied consistently and in line with the IB’s minimum requirements. The style should be applied in both the final draft of the essay and in the initial research stages of taking notes. This is good practice, not only for producing a high-quality final product, but also for reducing the opportunities and temptation to plagiarize.
The IB’s minimum requirements include:
Any references to interviews should state the name of the interviewer, the name of the interviewee, the date and the place of the interview.
For more detailed information on styles for citations and referencing please refer to:
8. Identify which system of academic referencing you will use, ensuring that it meets the minimum requirements for the IB.
References to online materials should include the title of the extract used as well as the website address, the date it was accessed and, if possible, the author.
In other words, all electronic sources must be date stamped by including the date the student accessed the resource (for example, accessed 12 March 2016). Caution should be exercised with information found on websites that do not give references or that cannot be cross-checked against other sources. The more important a particular point is to the essay, the more the quality of its source needs to be evaluated.