(1930). [List of firms supplying natural history material to colleges and individuals]. [publisher not identified].
Chicago Style (17th ed.) Citation[List of Firms Supplying Natural History Material to Colleges and Individuals]. Washington, D.C.: [publisher not identified], 1930.
MLA (9th ed.) Citation[List of Firms Supplying Natural History Material to Colleges and Individuals]. [publisher not identified], 1930.
Warning: These citations may not always be 100% accurate.