Johnson, N. K. (1980). Character Variation and evolution of sibling species in the Empidonax difficilis-flavescens complex <Aves: Tyrannidae>. Univ. of California Pr.
I tāruatia paitia ki te papatopenga
Kua rahua te tārua ki te papatopenga
Tohutoru Kātū Chicago (17th ed.)
Johnson, Ned K. Character Variation and Evolution of Sibling Species in the Empidonax Difficilis-flavescens Complex <Aves: Tyrannidae>. Berkeley [usw.]: Univ. of California Pr, 1980.
I tāruatia paitia ki te papatopenga
Kua rahua te tārua ki te papatopenga
Tohutoro MLA (9th ed.)
Johnson, Ned K. Character Variation and Evolution of Sibling Species in the Empidonax Difficilis-flavescens Complex <Aves: Tyrannidae>. Univ. of California Pr, 1980.
I tāruatia paitia ki te papatopenga
Kua rahua te tārua ki te papatopenga
Kia tūpato: Kāore pea ēnei kupu hautoa i te ōrite pū 100%.