Παραπομπή σε μορφή APA (7η εκδ.)

Champion, H. (2023). An investigation of certain factors concerning the resin-tapping industry in Pinus longifolia. Superintendent Government Printing.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Champion, H.G. An Investigation of Certain Factors Concerning the Resin-tapping Industry in Pinus Longifolia. Superintendent Government Printing, 2023.

Παραπομπή σε μορφή MLA (9th εκδ.)

Champion, H.G. An Investigation of Certain Factors Concerning the Resin-tapping Industry in Pinus Longifolia. Superintendent Government Printing, 2023.