Which research source would provide the most bias-free information about h. vondermoot’s life

The source of research that would provide the most unbiased information about H. Vondermoot's life would be a Biographical Dictionary

Explanation:

A biographical dictionary is similar to an ordinary dictionary, but it has biographical information about a particular personality. For this reason, this would be a great source of research to gain more unbiased information about the life of H. Vondermoot.

we need to see the statements.