Free rings and their relations.

I tiakina i:
Ngā taipitopito rārangi puna kōrero
Kaituhi matua: COHN, P.M
Hōputu: Pukapuka
Reo:Ingarihi
I whakaputaina: London, Academic Pr., 1971.
Rangatū:(London mathematical society monographs)
Ngā marau:
Ngā Tūtohu: Tāpirihia he Tūtohu
Kāore He Tūtohu, Me noho koe te mea tuatahi ki te tūtohu i tēnei pūkete!