APA Style
Viljoen, G. et al (2015).
Stable Isotopes to Trace Migratory Birds and to Identify Harmful Diseases .
London:
Springer.
MLA Style
Viljoen, G.J.. et al.
"Stable Isotopes to Trace Migratory Birds and to Identify Harmful Diseases".
London:
Springer,
2015.
Text.