Edit the references of the argument: Collective hallucination has never been observed in thousands of people.

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Mention in the headings below the references that support and elaborate on this argument. Add them in the section Bibliography when it is a paper text, Webliography when it is an article published on a site, Videography when it is a video available online.

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Depending on the box you check here, you will add a warning message indicating the gaps in the references:

Too many references: the bibliography lists more than ten publications;
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Bibliography

Author(s) Enter here the full name(s) of the author(s) of the reference in the form “First name Last name”. For each author, click on it to validate it. Tip: If an author has already been quoted, just enter the first letters of his name. You will then only have to select it from the drop-down list.
Article title Enter the full title of the article or webpage here. Tip: If this article has already been cited, all you have to do is enter part of its title. You will then only have to select it from the drop-down list.
Book, journal or site title Enter here the title of the book, newspaper, magazine or the name of the site in which this reference is published. Tip: If this work, this journal or this site has already been registered in Wikidebates, then all you have to do is enter part of its title. You will then only have to select it from the drop-down list.
Journal volume If this reference is published in a scientific or academic journal in different volumes, indicate the number of the volume concerned here.
Journal number If this reference is published in a numbered periodical (review, magazine), enter the number of this periodical here.
Location in the book If only part of the book deals with the argument, you can specify it here.
Publishing house In the case of a book, enter here the name of its publishing house (not to be confused with the collection). Tip: If this publishing house has already been registered in Wikidebates, then all you have to do is enter part of its name. You will then only have to select it from the drop-down list.
Place of publication In the case of a book, enter here the name of the city in which it was published. Tip: If this city has already been registered in Wikidebates, then all you have to do is enter the first letters of its surname or first name. You will then only have to select it from the drop-down list.
Release date Enter here the date on which this text appeared (month/day/year). Note: For a book that has been published multiple times, note the publication date of the book you are using for this citation.
Link If this publication is available online, copy and paste its web address here.
Warning(s) If the reference poses a problem, report it by checking the corresponding box(es): Unreliable source: … Off topic : …	Insufficient quality reference Incomplete reference