Information that is not essential to explain your findings, but that supports your analysis (especially repetitive or lengthy information), validates your conclusions or pursues a related point should be placed in an appendix (plural appendices). Sometimes excerpts from this supporting information (i.e. part of the data set) will be placed in the body of the report but the complete set of information ( i.e. all of the data set) will be included in the appendix. Examples of information that could be included in an appendix include figures/tables/charts/graphs of results, statistics, questionnaires, transcripts of interviews, pictures, lengthy derivations of equations, maps, drawings, letters, specification or data sheets, computer program information.
There is no limit to what can be placed in the appendix providing it is relevant and reference is made to it in the report. The appendix is not a catch net for all the semi-interesting or related information you have gathered through your research for your report: the information included in the appendix must bear directly relate to the research problem or the report's purpose. It must be a useful tool for the reader (Weaver & Weaver, 1977).
Each separate appendix should be lettered (Appendix A, Appendix B, Appendix B1, Appendix B2, Appendix C, etc). The order they are presented in is dictated by the order they are mentioned in the text of the report. It is essential to refer to each appendix within the text of the report; for example,
For the manufacturer's specification, see Appendix B
Appendix C contains the YoY shareholder account growth rates. The rates are high. The increasing growth rate of accounts will significantly affect the valuation of the company.
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Note: This is an answer only for citing appendices you create in the body of your paper. If you are looking for information on how to cite sources within your appendix,please follow this link.
Example in-text citation:
Inner city mental health care access continues to be a problem (see Appendix for a table showing mental health care access by city).
Explanation and details:
You should use parenthetical in-text citations, similar to the ones used for your other references. In the example included in the Manual it also includes brief explanatory text for why the reader should consult the appendix.
If you have only one appendix title it Appendix with a centered heading starting on its own page. If you have more than one appendix use letters to differentiate them: A, B, C, etc. Be sure to include the letters in your in-text citations when you have more than one appendix so the reader knows which appendix to consult.
Details on citing appendices can be found on page 39 of the APA Manual.