How to cite ISO standards?

check out this blog entry on Citing ISO Standards or this site on Bibliographic Citation Standards and Schemes As you can see there is no definitive answer to you question.

Maybe you ask your thesis advisor.

Depending on how a standard is published, it should be cited either as an article, a book, or a technical report.

• If the standard is published as a journal article or has an associated journal article, e.g., then it should be cited as journal article. Example: the BioBricks Assembly Standard.

• If the standard is published as a stand-alone book (e.g., being sold by a standards organization), then it should be cited as a book. Example: many ANSI or ISO standards.

• If the standard is published through some other archival mechanism, then it should typically be cited as a technical report. Example: IETF standards.

How exactly you format such citations then depends on the citation style that you are being asked to use (e.g., MLA, IEEE, Harvard).