Format: 

[1]Title of Standard, Standard number, Date. [Online]. Available: URL

[2]Title of Standard, Standard number, Date.

Examples: 

[1]ASTM D629-15 Standard Test Methods for Quantitative Analysis of Textiles, ASTM D629-15, Mar. 2015. [Online]. Available: https://www.astm.org/Standards/D629.htm

[2]Electrodes, Graphite, Spectrometric Grade, MIL-DTL-8971F, Sep. 16, 2013. [Online]. Available: http://standards.globalspec.com/std/1631456/dla-mil-dtl-8971f

Notes: 

Be sure to include the standard number as part of the citation (see "Standards: Basic Format," p. 38). For URLs, provide the link to the publisher's website/standard library whenever possible, not the link to the library database as per APA style (see pg. 38, "On-Line Sources").

Questions? Contact an RIT Librarian at libraryhelp@rit.edu

Source:
IEEE - Standards (p. 38)