Platje, Joost. : Management of environmental quality. Volume 19, Number 2, Current issues of sustainable development [electronic resource] / Guest editors: Professor Joost Platje and Professor Walter Leal Filho.
Platjouw, Froukje Maria., : Environmental law and the ecosystem approach : maintaining ecological integrity through consistency in law / Froukje Maria Platjouw.
Platko, Peter, : Advances and Trends in Engineering Sciences and Technologies II : proceedings of the 2nd International Conference on Engineering Sciences and Technologies, High Tatras Mountains, Tatransk Matliare, Slovak Republic, 29 June-1 July 2016 / edit
Plato, active 12th century, : Liber quadripartiti Ptolemei id e[st] quattuor tractatuu[m] : in radicanti discretione [per] stellas d[e] futuris & i[n] hoc mundo co[n]structio[n]is & destructio[n]is co[n]tinge[n]tib[us] cuius in p[ri]mo tractatu su[n]t. 24. capita.