How do I correctly cite the C++ standard or its drafts?

I would cite the current version of C++ standard, based on the APA Style (6th edition), in particular, based on the APA guidelines for citing electronic sources (Web publications), as follows:

ISO/IEC. (2014). ISO International Standard ISO/IEC 14882:2014(E) – Programming Language C++. [Working draft]. Geneva, Switzerland: International Organization for Standardization (ISO). Retrieved from https://isocpp.org/std/the-standard

NOTE: When the current standard will be finalized and published, the citation will have to be updated accordingly by removing "[Working draft.]" phrase and updating the year (i.e., 2015).

One can find nearly every citation for the C++ standards in BibTeX format here:

http://ftp.math.utah.edu/pub/tex/bib/isostd.html

For example, here is the reference to the ISO C++98 standard:

@Book{ISO:1998:IIP,
  author =       "{ISO}",
  title =        "{ISO\slash IEC 14882:1998}: {Programming} languages
                 --- {C++}",
  publisher =    pub-ISO,
  address =      pub-ISO:adr,
  pages =        "732",
  day =          "1",
  month =        sep,
  year =         "1998",
  ISBN =         "????",
  ISBN-13 =      "????",
  LCCN =         "????",
  bibdate =      "Tue Dec 12 06:45:55 2000",
  bibsource =    "http://www.math.utah.edu/pub/tex/bib/isostd.bib;
                 http://www.math.utah.edu/pub/tex/bib/mathcw.bib",
  note =         "Available in electronic form for online purchase at
                 \path=http://webstore.ansi.org/= and
                 \path=http://www.cssinfo.com/=.",
  price =        "CHF 351, US\$18 (electronic), US\$252 (print);
                 US\$245.00",
  URL =          "http://webstore.ansi.org/ansidocstore/product.asp?sku=ISO%2FIEC+14882%2D1998;
                 http://webstore.ansi.org/ansidocstore/product.asp?sku=ISO%2FIEC+14882%3A1998;
                 http://www.iso.ch/cate/d25845.html;
                 https://webstore.ansi.org/",
  acknowledgement = ack-nhfb,
  xxISBN =       "none",
}

You can copy and paste this into your .bib file containing citations for LaTeX, which you should be using instead of Word anyway : ) You can use the natbib package to format it into whichever citation style you like.