Παραπομπή σε μορφή APA (7η εκδ.)

Puura, E. (1998). Weathering of mining waste rock containing alum shale and limestone: A case -study of the maardu dumps,estonia. Royal Institude of technology.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Puura, Erik. Weathering of Mining Waste Rock Containing Alum Shale and Limestone: A Case -study of the Maardu Dumps,estonia. Stockholm: Royal Institude of technology, 1998.

Παραπομπή σε μορφή MLA (8th εκδ.)

Puura, Erik. Weathering of Mining Waste Rock Containing Alum Shale and Limestone: A Case -study of the Maardu Dumps,estonia. Royal Institude of technology, 1998.