MCKERRELL, Hugh; MCCAWLEY, J C. Soil phosphorus levels on archaeological sites. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 104, p. 301–306, 1974. DOI: 10.9750/PSAS.104.301.306. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8833. Acesso em: 19 apr. 2024.