General Format for Footnotes/Endnotes
#. Name of the database (descriptive phrase or record locator; access date), URL.
Subsequent references to same same
Next #. Name of database, descriptive phrase or record locator.
Example
1. NASA/IPAC Extragalactic Database (object name IRAS F00400+4059; accessed April 6, 2016), http://ned.ipac.caltech.edu/.
2. NASA/IPAC, object name IRAS F00400+4059.
If the title for standard is long a shorted title can be used in subsequent references so long is it is still obvious where it came from. The full title must be used for the first reference to a source. (See example above)
General Format for Bibliographic Entry
Name of the database (descriptive phrase or record locator; access date). URL.
Example
NASA/IPAC Extragalactic Database (object name IRAS F00400+4059; accessed April 6, 2016). http://ned.ipac.caltech.edu/.