Akinyi, M., & Kamau, P. [Data card 49740 for plant Dipsacaceae Pterocephalus frutescens: Known under various names in local languages.
Chicago-viite (17. p.)Akinyi, Margaret, ja Peris Kamau. [Data Card 49740 for Plant Dipsacaceae Pterocephalus Frutescens: Known Under Various Names in Local Languages.
MLA-viite (8. p.)Akinyi, Margaret, ja Peris Kamau. [Data Card 49740 for Plant Dipsacaceae Pterocephalus Frutescens: Known Under Various Names in Local Languages.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.