1.		Preferences and willingness to pay for bird-watching tour and interpretive services using a choice experiment / Choong-Ki Lee [et al.] Resp- Sec.: Choong-Ki, Lee Jin-Hyung, Lee Tae-Kyun, kim Mjelde, James W.
2.		Preferences and willingness to pay for bird-watching tour and interpretative services using a choice experiment / Choong-Ki Lee [et al.] Resp- Sec.: Choong-Ki, Lee Jin-Hyung, Lee Tae-Kyun, kim Mjelde, James W.