Παραπομπή σε μορφή APA (7η εκδ.)

Alturas, G. S. (1978). An empirical validation of instructional materials on methods of improving water potability.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Alturas, Gerarda Sale. An Empirical Validation of Instructional Materials on Methods of Improving Water Potability. 1978.

Παραπομπή σε μορφή MLA (9th εκδ.)

Alturas, Gerarda Sale. An Empirical Validation of Instructional Materials on Methods of Improving Water Potability. 1978.