সাঁচ:Ethnologue21 is designed for use in the reference section of a language article. It links to the appropriate article at Ethnologue, 21তম edition.

One parameter
Replace xyz with the ISO 639-3 code for the language. The page name will be used as the link text
{{Ethnologue21|xyz}}
{{E21|xyz}}
Two parameters
Replace ABC with the link text to be displayed. This may be useful if the Ethnologue name differs from the page name of the Wikipedia article.
{{Ethnologue21|xyz|ABC}}
{{E21|xyz|ABC}}
No parameters
The template will revert to a generic citation and link to Ethnologue
{{Ethnologue21}}
{{E21}}
One parameter
{{Ethnologue21|eng}}
Ethnologue21/doc at Ethnologue (21st ed., 2018)
Two parameters
{{Ethnologue21|eng|English}}
English at Ethnologue (21st ed., 2018)
No parameters
{{Ethnologue21}}
Ethnologue: Languages of the World (21st সম্পাদনা). প্ৰকাশক Dallas, Texas: SIL International. 2018. http://www.ethnologue.com/. 

For a reference to the Ethnologue population figures, enter "e21" in the ref parameter of {{Infobox language}}. This will automatically generate a reference based on this template, and is easier for other editors to update.