1. Notable Historical Figures
- Ludwig Knoop (1821–1894): * Ludwig Knoop – Wikipedia
- Baron Johann Knoop (1846–1918): * Johann Knoop – Tarisio (Instrument Archives)
- Johann Hermann Knoop (1706–1769): * Johann Hermann Knoop – Pomology History
2. Genealogical & Research Tools
- WikiTree – Knoop Name Study: * Knoop Name Study – WikiTree
- Ancestry.com – Knoop Surname: * Knoop Surname Records – Ancestry
- Hans Knoop & The Menten Case: * The Case of Pieter Menten (Journalism History)
3. Contemporary & Cultural Figures
- Bobby Knoop (MLB Player): * Bobby Knoop Stats – Baseball Reference
- Guido Knopp (Historian): * Guido Knopp – Official Profile
- Gerhard Knoop (Theatre Director): * Gerhard Knoop – Store norske leksikon
4. Technical & Scientific References
- Knoop Hardness Test: * Knoop Hardness Scale – Britannica