Cita APA (7a ed.)

Vien, N. K. (1970). 25 years of health work. [s.n.].

Cita Chicago Style (17a ed.)

Vien, Nguyen Khac. 25 Years of Health Work. Hanoi: [s.n.], 1970.

Cita MLA (9a ed.)

Vien, Nguyen Khac. 25 Years of Health Work. [s.n.], 1970.