Final answer:
To insert a built-in bibliography without a pre-formatted heading in the blank paragraph, use the 'Built-In > Insert' option.
Step-by-step explanation:
To insert a built-in bibliography without a pre-formatted heading in the blank paragraph at the end of the document, you can use the following option:
- Built-In > Insert
This option allows you to insert a built-in bibliography without a pre-formatted heading directly into your document. You can access this option through the Insert tab in your word processing program.