Hamid Zübeyr Koşay: Çiftçilik

http://www.biyografya.com/biyografi/12466

https://www.academia.edu/31146182/T%C3%BCrkiye_Halk%C4%B1n%C4%B1n_Maddi_K%C3%BClt%C3%BCr%C3%BCne_Dair_Ara%C5%9Ft%C4%B1rmalar_Ziraat_T%C3%BCrk_Etnografya_Dergisi_Say%C4%B1_1_H%C3%A2mit_Z._Ko%C5%9Fay