We expect acknowledgements similar to "Simulations were done using the Advanced Regional Prediction System (ARPS) developed by the Center for Analysis and Prediction of Storms, Unversity of Oklahoma". Currently the standard reference to ARPS is

Xue, M., K.K. Droegemeier, V. Wong, A. Shapiro and K. Brewster. 1995: ARPS Version 4.0 User's Guide, 380pp [Available from CAPS, University of Oklahoma, Norman OK 73019, USA].