The REFERENCES section should contain complete citations following standard form. The form of the citation depends on the type of source being referenced, and is different for whole books, chapters in books, and articles published in a journal. One good format to follow is that used in the Chemical Engineering Progress journal, published by AIChE. The references should be numbered and listed in the order they were cited in the body of the report. In the text of the report, a particular reference can be cited by using a numerical superscript that corresponds to its number in the reference list. If a reference has not been actually consulted, it should be listed "as discussed in [name of the work that discussed the reference]".
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Biology lab reports have a specific format that must be followed to present the experiment and findings in an organized manner. Once you learn the main components of the lab report and what they should include, you will find it isn't too difficult to actually write the report. Specific instructors may have unique criteria specific to their class, so be sure to check your course materials for formatting instructions before you submit your paper.
How do you know when you have enough information in your Abstract? A simple rule-of-thumb is to imagine that you are another researcher doing an study similar to the one you are reporting. If your Abstract was the only part of the paper you could access, would you be happy with the information presented there?