The following are our recommendations for citing products from The HDF Group:

HDF5 

  The HDF Group. Hierarchical Data Format, version 5, 1997-NNNN.
  https://www.hdfgroup.org/HDF5/.

...

@ONLINE{hdf5,
    author = {{The HDF Group}},
    title = "{Hierarchical Data Format, version 5}",
    year = {1997-NNNN},
    note = {https://www.hdfgroup.org/HDF5/}
}

HDFView

  The HDF Group. HDF Viewer, version 3.1.3, 2006
  https://www.hdfgroup.org/downloads/hdfview/. 

Highly Scalable Data Service (HSDS) 

  The HDF Group. Highly Scalable Data Service, 2017-NNNN.
  https://www.hdfgroup.org/solutions/highly-scalable-data-service-hsds/.