APA
Rigzin Research & Consultancy Services, . (2013). RCSE/BCSE Prelims 2013/ (Acc: D 557). Thimphu Bhutan: Rigzin Research & Consultancy Services.
Chicago
Rigzin Research & Consultancy Services, . 2013. RCSE/BCSE Prelims 2013/ (Acc: D 557). Thimphu Bhutan: Rigzin Research & Consultancy Services.
Harvard
Rigzin Research & Consultancy Services, . (2013). RCSE/BCSE Prelims 2013/ (Acc: D 557). Thimphu Bhutan: Rigzin Research & Consultancy Services.
MLA
Rigzin Research & Consultancy Services, . RCSE/BCSE Prelims 2013/ (Acc: D 557). Thimphu Bhutan: Rigzin Research & Consultancy Services. 2013.