Pfaltz, John "TREETRAN - A FORTRAN IV Subroutine Package for Manipulation of Rooted Trees"

Findler, Nicholas et al (1972) Findler, Nicholas et al "Four high-level extension of FORTRAN IV : SLIP, AMPPL-II, TREETRAN, SYMBOLANG" New York : Spartan Books, 1972  

Languages mentioned TREETRAN {1965}