GLOBALVIEW-CO2 is freely available. Anyone using GLOBALVIEW-CO2 is agreeing to acknowledge its authors. The list of cooperating scientists and their organizations and institutions is large and would be cumbersome to include as a reference, thus GLOBALVIEW-CO2 and its contributors should be referenced as [GLOBALVIEW-CO2, 2013], and in a list of references as

Cooperative Global Atmospheric Data Integration Project. 2013, updated annually. Multi-laboratory compilation of synchronized and gap-filled atmospheric carbon dioxide records for the period 1979-2012 (obspack_co2_1_GLOBALVIEW-CO2_2013_v1.0.4_2013-12-23). Compiled by NOAA Global Monitoring Division: Boulder, Colorado, U.S.A. Data product accessed at http://dx.doi.org/10.3334/OBSPACK/1002