Guthrie, Malcolm and Archibald Norman Tucker. 1956. "Linguistic Survey of the Northern Bantu Borderland." v. 1: Oxford Univ. Press; International African Inst. (IAI).

Guthrie, Malcolm. 1971. "S.30 Sotho-Tswana Group: S.31a Tswana (Chwana), S.31b Kgatla, S.31c Ngwatu, S.31d Kxalaxadi, S.32a Pedi (North Suthu), S.33 South Sotho (Suthu)." In Comparative Bantu, v. 2: 62-63. Gregg International.

Guthrie, Malcolm. 1971. "R.40 Yeye Group: R.41 Yei (Yeye, Kuba)." In Comparative Bantu, v. 2: 61. Gregg International.

Guthrie, Malcolm. 1971. "M.20 Nyika-Safwa Group: M.21 Wanda (Wandia), M.22 Mwanga (Namwanga), M.23 Nyiha (Nyika), M.24 Malela, M.25 Safwa." In Comparative Bantu, v. 2: 56. Gregg International.

Guthrie, Malcolm. 1971. "M.10 Fipa-Mambwe Group: M.11 Pimbwe, M.13 Fipa, M.14 Rungu, M.15 Mambwe." In Comparative Bantu, v. 2: 56. Gregg International.

Guthrie, Malcolm. 1971. "K.40 Subiya Group: K.41 Totela, K.42 Subiya." In Comparative Bantu, v. 2: 54. Gregg International.

Guthrie, Malcolm. 1971. "K.30 Luyana Group: K.31 Luyana (Luyi), K.32 Mbowe, K.33 Kwangari." In Comparative Bantu, v. 2: 53-54. Gregg International.

Guthrie, Malcolm. 1971. "G.30 Zigula-Zaramo Group: G.31 Zigula (Zigua), G.32 Nghwele, G.33 Zaramo (Dzalamo), G.35 Ruguru, G.36 Kami, G.37 Kutu, G.38 Vidunda." In Comparative Bantu, v. 2: 49-50. Gregg International.

Guthrie, Malcolm. 1971. "G.20 Shambala Group: G.21 Tubeta (Taveta), G.22 Asu (Pare), G.23 Sambaa (Shambala), G.24 Bondei." In Comparative Bantu, v. 2: 49. Gregg International.

Guthrie, Malcolm. 1971. "E.70 Nyika-Taita Group: E.71 West Pokomo (Pfokomo), E.72a Giryama, E.72b Kauma (Nika, Nyika), E.72c Conyi, E.72d Duruma, E.72e Rabai, E.73 Digo, E.74a Dabida (Taita), E.74b Sagala (Taita)." In Comparative Bantu, v. 2: 46-47. Gregg International.