"यह उनकी किताब है।"
Translation:This is their book.
August 8, 2018
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Unki can be used for their, his or her. It is used for his or her when the person concerned is being referred to formally / respectfully (For casual or informal reference "uski" would be used) And since kitab is feminine gender, Unki is used and not unka or unke(these are used respectively for singular and plural masculine genders)
[deactivated user]
Unkee (उनकी) is not plural, it's feminine. Kitaab is feminine, so the preceeding pronoun must accommodate that by using the feminine ending ki (की)