Roberts geographic variation of Southern African BirdsA guide to the plumage variation of 613 bird races in Southern AfricaAvChittenden Hugh,Allan Davidm. fl.Häftad, Engelska, 2012300 krDu bevakarBevakaTillfälligt slut
Warriors, dilettantes and businessmenBird collectors during the mid-19th to mid-20th centuries in Southern AfricaAvW.R.J. DeanHäftad, Engelska, 2016196 krDu bevakarBevakaTillfälligt slut
