Grønstøl, G., Myking, O.L., Lislevand, T. and Byrkjedal, I. 2007. Plasma testosterone levels of incubating female Northern Lapwings Vanellus vanellus. Ornis Norvegica. 30, (Jan. 2007), 124–126. DOI:https://doi.org/10.15845/on.v30i0.176.