Alonso, J.C., Palacín, C., Onrubia, A., Aboulouafae, R., Amezian, M., El Idrissi Essougrati, A., El Khamlichi, R. and Noaman, A. 2016. Alarming decline and range reduction of the highly threatened Great Bustard Otis tarda in Morocco. Ostrich: 1–4.
Alonso, J.C., Palacín, C., Onrubia, A., Aboulouafae, R., Amezian, M., El Idrissi Essougrati, A., El Khamlichi, R. and Noaman, A. 2016. Alarming decline and range reduction of the highly threatened Great Bustard Otis tarda in Morocco. Ostrich: 1–4.