Several government agencies and private companies have developed several biomathematical fatigue models used to assess and monitor fatigue. Some of these models have been developed for use in specific industries, such as aviation, but can still be applied to any organisation which has people at its core. The biomathematical models in this document have taken many years to develop, validate, and use. The IOGP-IPIECA Health Committee has prepared a comprehensive reference list of the sources used in modelling, as well as investigative reports that have utilised these models. IOGP-IPIECA does not endorse the use of any particular biomathematical fatigue model and is providing the names of the models and resource links as a reference only. This list, IOGP Report 626-2, is available as a companion resource to Report 626.