i added all the references at the end of my report. and my teacher wrote that all of them must be referenced to in the report.

Now i have another question: how can i reference this?
i said 'the powerpoint was created utilizing different sets of data from various websites'
and my teacher circled around 'various websites' and said reference them.
how can i do that?

http://bcs.bedfordstmartins.com/resdoc5e/#1

Click on Documenting Sources in the closest subject area listed to get directions about how to cite websites.

Also, go here -- http://bcs.bedfordstmartins.com/resdoc5e/pdf/Hacker-Mira-APA-2010.pdf -- and skip to pages 12 and 13 where you can see examples of a variety of sources cited.

To properly reference the information from various websites in your report, you will need to follow a specific citation style, such as APA, MLA, or Chicago. Here is a general guideline to reference web sources using APA style:

1. Find the necessary information: Locate the essential details for each website you used, including the author, publication date, title of the specific webpage, the website's name, and the URL.

2. Format the in-text citation: When you mention the information from a specific website in the body of your report, you should include an in-text citation. For example, you could write: "The powerpoint was created utilizing different sets of data from various websites (Author's Last Name, Year, p. X)".

3. Create a reference list entry: At the end of your report, you need to include a reference list that provides the full details of each website you referenced. The format for the reference entry depends on the type of website. Here is an example of how to cite a website in APA format:

Author's Last Name, First Initial. (Year). Title of the webpage. Name of the website. URL

For instance, if you utilized data from a webpage on a website called "Example.com" where the author's name was John Smith and the page was published in 2020, your reference entry would look like:

Smith, J. (2020). Title of the webpage. Example.com. Retrieved from [insert URL]

Remember to replace "Title of the webpage" with the actual title of the specific webpage you used, and "[insert URL]" with the URL of that webpage.

By following this general guideline and adapting it to the specific citation style your teacher requires, you should be able to properly reference your sources in your report.