3 literature references for Sphagnum simplex Fife, 1996:

Author: Crosby, M. R. and others - REVISED
Year: 1999
Title: REVISED: accepted in a monograph, revision, or descriptive flora since 1963
Source: Checklist Mosses
Author: Cardot
Year: 1911
Title:
Source: Rev. Bryol.
Author: Fife
Year: 1996
Title:
Source: New Zealand J. Bot.