APA
Ham J. C., Shore Sheppard Lara, Li Xianghong & National Bureau Of Economic Research. (2009). Seam bias, multiple-state, multiple-spell duration models an. Cambridge: NBER.
Chicago
Ham John C, Shore Sheppard Lara, Li Xianghong and National Bureau Of Economic Research. 2009. Seam bias, multiple-state, multiple-spell duration models an. Cambridge: NBER.
Harvard
Ham J. C., Shore Sheppard Lara, Li Xianghong and National Bureau Of Economic Research. (2009). Seam bias, multiple-state, multiple-spell duration models an. Cambridge: NBER.
MLA
Ham John C, Shore Sheppard Lara, Li Xianghong and National Bureau Of Economic Research. Seam bias, multiple-state, multiple-spell duration models an. Cambridge: NBER. 2009.