5Collar NJ, Crosby MJ, Stattersfield AJ. 1994. Birds to Wateh 2. The World List of Threatened Birds[ M]. Cambridge (UK) : Bird Lit- In- ternational.
6Kurt B, Heinz UR. 2001. Reproductive success of water pipits in an al- pine environment[ J]. The Condor, 103 : 510 - 520.
7Takahashi M, Ohkawara K. 2007. Breeding behavior and reproductive success of Grey-headed Lapwing Vanellus cinereus on farmland in cen- tral Japan [ J ]. Ornithological Science, 6 ( 1 ) : 1 - 9.
8Todd AG, Terry LS, Elizabeth, et al. 2004, Time specific variation in passerine nest survival: New insights into old question[ J].Auk, 122: 661 - 672.