The Cite This Study link in the image above is provided for every ICPSR dataset.  When you follow that link, the complete citation is presented in a pop-up window along with the format used (as shown in the image below - this is not a named citation style).  Capture the citation using copy/paste or use the links provided to export the citation to a citation management software program such as EndNote or Zotero.

The Roper Center for Public Opinion Research provides a guide to citing Roper data.

When viewing Study Details for a poll, notice the CITE STUDY tab, highlighted in a red box below.  There is also a citation provided toward the bottom of the display (also in a red box).

When viewing an individual IPoll question, the CITE button is easy to find.

After clicking on the CITE button, a popup window will allow you to choose a citation style using a pulldown menu (APA 7th Edition is selected in the screenshot below), then copy/paste or export the citation (text format is the only option).

Paste the dataset DOI into the CrossCite tool to generate a citation.  Each step is described on the screen, selecting a style and languageneeded from the pulldown menus.  Use the COPY TO CLIPBOARD option to capture the result and paste into an email, document, etc.  

Notice the differences between the citation generated by the ICPSR site (no specified style) and the APA Style citation generated by the DOI Citation Formatter.  Evidence that you always should proofread your citations!!

Comparing Citations Generated by ICPSR and DOI Citation Formatter

ICPSR Formatted Citation	DOI Citation Formatter