"Why Mama Ngina met Mzee Moi". The Star Kenya. 23 January 2017. Mama Ngina was born Ngina Muhoho in 1933, daughter of Chief Muhoho wa Gathecha, in Kiambu District, Central Province.
worldcat.org
New Scientist. Reed Business Information. 22 May 1975. hlm. 452. ISSN0262-4079. Diakses tanggal 8 May 2011.