Apsidium: Hassium: Basic information and atomic structure.
ChemGlobe: Hassium: Electronic data along with general information and facts.
ChemicalElements.com: Hassium: Basic information, diagram of atomic structure, and facts.
Chemistry of Hassium, Element 108: Article regarding a study conducted at the Berkeley National Laboratory.
EnvironmentalChemistry.com: Hassium: Atomic structure and table of nuclides.
It's Elemental: Hassium: Basic physical and historical information.
LANL: Hassium: Basic information and history.
Lenntech: Hassium: Basic data.
Visual Elements: Hassium: General and physical information, and key isotopes.
WebElements: Hassium: Information on history, isolation, and properties.
Wikipedia: Hassium: Basic physical and historical information.