Vipau, U. (1974). I gat nupela taim nau: Wanpela pilai bilong Niugini stret. St. Benedict's Teachers' College.
Tohutoru Kātū ChicagoVipau, Umgra. I Gat Nupela Taim Nau: Wanpela Pilai Bilong Niugini Stret. Wewak: St. Benedict's Teachers' College, 1974.
Tohutoro MLAVipau, Umgra. I Gat Nupela Taim Nau: Wanpela Pilai Bilong Niugini Stret. St. Benedict's Teachers' College, 1974.
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