NIST Chemistry WebBook
Recommended citation for data from Takehiko Shimanouchi:
Data in the WebBook should be cited as though they are in a series of chapters in a book. The individual chapters are not the pages of data on a single molecule but rather the collection of data of a particular type. The "book" containing these chapters is the NIST Standard Reference Database Number 69, Eds. P.J. Linstrom and W.G. Mallard.
The citation for data from Takehiko Shimanouchi should be as follows:
Takehiko Shimanouchi, "Molecular Vibrational Frequencies" in NIST Chemistry WebBook, NIST Standard Reference Database Number 69, Eds. P.J. Linstrom and W.G. Mallard, National Institute of Standards and Technology, Gaithersburg MD, 20899, https://doi.org/10.18434/T4D303, (retrieved April 20, 2021).