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For details on how to cite technical reports and gray literature look under section 10.4 in the APA Publication Manual (7th Edition), starting on page 329.
Basic reference list format for a print report
Author Last Name, First Initial. (Year). Title of Report (Report No. #). Publisher Name.
Basic reference list format for an online report
Author Last Name, First Initial. (Year). Title (Report No. #). DOI or URL
Notes:
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For example: Ramirez, Z. A., Jones, B. C., & Smith, D. C.
If no people are listed as authors use the organization as author.
Like this (the formatting in this example is off):
Lein, E. S., Hawrylycz, M. J., Ao, N., Ayres, M., Bensinger, A.,
Bernard, A., . . . Jones, A. R. (2007). Genome-wide
atlas of gene expression in the adult mouse brain. Nature, 445
(7124), 168-176. doi:10.1038/nature05453
Note: The first six authors are listed; all subsequent authors except the last are omitted and replaced with an ellipsis; then list name of the last author.
In-text example: (Lein et al., 2007)
As for an example using two organizing parties in addition to the 100+ authors, I'm not sure I understand. If you want more assistance, you can use the chat option (http://askus.library.wwu.edu/) to get direct help. More APA citation examples can be found here: http://libguides.wwu.edu/ld.php?content_id=18901398.