Moncrieff, A. E., Johnson, O., Lane, D. F., Beck, J. R., Angulo, F., and Fagan, J. 2018. A new species of antbird (Passeriformes: Thamnophilidae) from the Cordillera Azul, San Martín, Peru.The Auk: Ornithological Advances 135:114-126. [pdf] [html]
Johnson, O. 2017. Notes on the nesting behavior of the Gray-mantled Wren (Odontorchilus branickii). Ornitologia Neotropical 28:175-179. [pdf] [html]
Cooper, J. C., Johnson, O., Davis, T. J., Terrill, R. S., Wolfe, J. D., Brzeski, K. E., Motove Etingüe, A., and Powell, L. L. 2017. Notes on the distribution of the avifauna of Bioko Island, Equatorial Guinea, including one new country record. Malimbus 39:1-15. [pdf]
Johnson, O. 2016. Pearly-breasted Conebill (Conirostrum margaritae), Neotropical Birds Online (T. S. Schulenberg, Editor). Ithaca: Cornell Lab of Ornithology. [html]
Shizuka, D., Chaine, A. S., Anderson, J., Johnson, O., Laursen, I. M., and Lyon, B. E. 2014. Across-year social stability shapes network structure in wintering migrant sparrows. Ecology Letters 17:998-1007. [pdf] [html]
Johnson, O. and Billings, M. J. 2014. The Mangrove Yellow Warbler reaches California. Western Birds. 45:160-162. [pdf] [html]
Johnson, O., Pyle, P., and Tietz, J. 2013. The subspecies of the Song Sparrow on Southeast Farallon Island and in central California. Western Birds 44:162–170. [pdf] [html]
Johnson, O., Sullivan, B. S., and McCaskie, G. 2012. The 36th report of the California Bird Records Committee: 2010 records. Western Birds 43:164–188. [pdf] [html]
Johnson, O. 2010. Primer registro de rascón café (Amaurolimnas concolor) en Monteverde, Puntarenas, Costa Rica. Zeledonia 14:57–58. [pdf] [html]
Johnson, O. 2009. Review: Birds of the US-Mexico Borderlands: Distribution, Ecology, and Conservation, by J. Ruth, T. Brush, and D. Krueper, associate editors. Western Birds 41:60-61. [pdf] [html]