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Britannica Nobel Prize: Neptunium - Overview and basic data.
ChemGlobe: Neptunium - Electronic, thermal, and steric data along with an isotope table.
ChemicalElements.com: Neptunium - Basic information, atomic structure, and isotopes table.
EnvironmentalChemistry.com: Neptunium - Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Neptunium - Basic physical and historical information.
LANL: Neptunium - Basic information and history.
Lenntech: Neptunium - Physical data, chemical properties, health and environmental effects.
Visual Elements: Neptunium - General and physical information, source, and key isotopes.
Wikipedia: Neptunium - Notable characteristics, history, occurrence, isotopes, and weapons applications.