Παραπομπή σε μορφή APA (7η εκδ.)

Ragragio, J. M. (1981). The design and application of a manual sealogram method for spatial analysis in the Bicol IAD area.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Ragragio, Junio M. The Design and Application of a Manual Sealogram Method for Spatial Analysis in the Bicol IAD Area. 1981.

Παραπομπή σε μορφή MLA (9th εκδ.)

Ragragio, Junio M. The Design and Application of a Manual Sealogram Method for Spatial Analysis in the Bicol IAD Area. 1981.