Write an in-text citation at the point in your essay at which you refer to the illustration. Try to find the name of the illustrator, the title of the image and the date. Put the author's name and date of the image in parentheses after it is referred to, with a comma separating them. Write the title of the image in the parentheses if you do not know the author. If you can't find the date, write "n.d." in the parentheses to show this. You can refer to the author's name out of the parentheses if you wish. For example, "Smith (1998) shows this in his painting..." would be a suitable in-text citation. This is the same for both Harvard and APA format.
Write an entry in your reference list. Both Harvard and APA format referencing require a full list of the references you used in your essay to be written at the bottom of the essay. Find the author's name and put their surname followed by the initial of their first name at the beginning of the entry if possible. Use parentheses to enclose their specific job if you are using APA format. For example, you may write "Munly, J. (Illustrator)" if you were writing about a drawing.
Add in the year the image was created after the author's name and role (if using APA format). In APA style, the year of the work should be written in parentheses. The year shouldn't be enclosed in parentheses if you are using Harvard referencing style. For example, write "Hawkins, J. (Illustrator) (1999)" in APA format, and without the job description and parentheses in Harvard format.
Include the title of the work if possible. After writing the title of the work in italics, include a note to explain the type of work you are referencing. In APA format, the type of work should be enclosed in square brackets. In Harvard referencing style, the type of work should come after the title, separated by a comma. If the author of the work isn't known, put the title before the date. Include a description of the image if you do not have a title. For example, in Harvard format you could write, "No man's land, cartoon," and in APA the word "cartoon" should be placed in square brackets.
Write down the exact date you accessed the work after the title of the work (or the description). You should write "Retrieved" or "Accessed" followed by the full date. For example, you could write "Accessed 3rd January 2011" if you were using Harvard style or "Retrieved January 3rd 2011" if you were using APA. The word used prior to the date is interchangeable between styles, but typically, Harvard referencing dates should go date, month, year, and APA dates should go month, date and then year.
Finish with the web URL. This is the Internet address of the image, found at the top of your Internet browser. In APA format, write "From:" followed by the URL. In Harvard, enclose the URL in pointed brackets after the accessed date.