MacLeod, T., & MacLeod, M. P. (1964). Pigbesa-in a tagibu: Umirey Dumagat. Summer Institute of Linguistics in cooperation with the Bureau of Public Schools and the Institute of National Language of the Department of Education.

MacLeod, Tom, and Marjorie Pat MacLeod. Pigbesa-in a Tagibu: Umirey Dumagat. Manila: Summer Institute of Linguistics in cooperation with the Bureau of Public Schools and the Institute of National Language of the Department of Education, 1964.

MacLeod, Tom, and Marjorie Pat MacLeod. Pigbesa-in a Tagibu: Umirey Dumagat. Summer Institute of Linguistics in cooperation with the Bureau of Public Schools and the Institute of National Language of the Department of Education, 1964.