Tieleman BI & JB Williams (2002). "Effects of food supplementation on behavioural decisions of hoopoe-larks in the Arabian Desert: balancing water, energy and thermoregulation".PDFArxivat 2011-07-24 a Wayback Machine. Animal Behaviour 63: 519–529. doi:10.1006/anbe.2001.1927
Tieleman BI & JB Williams (2002). "Effects of food supplementation on behavioural decisions of hoopoe-larks in the Arabian Desert: balancing water, energy and thermoregulation".PDFArxivat 2011-07-24 a Wayback Machine. Animal Behaviour 63: 519–529. doi:10.1006/anbe.2001.1927