Steinkraus, Walter. 1969. 'Tifal phonology showing vowel and tone neutralization.' Kivung 2:1
Healey, Phyllis, and Walter Steinkraus. 1972. 'A Preliminary Vocabulary of Tifal with Grammar Notes.' Language Data Microfiche AP 5, S.I.L., Huntington Beach, v + 117 pp. ISBN0-88312-305-3