1. Group Behavior
2. Adams D. Allen S. Bjork J. Cooprider M. Fesnock A. Koenen M. Leatherman T. O'Neil S. Press D. Schirokauer D. Welch B. &Witcher B.(2006).San Francisco Bay Area Network Vital Signs Monitoring Plan. NPS/SFAN/NRR—2006/017 National Park Service Fort Collins CO.
3. Allen S. Codde S. Jensen H. Wheeler E. Becker B. Press D. &Roberts D.(2012).Northern elephant seal monitoring(Mirounga angustirostris)at Point Reyes National Seashore: 2008–2009 breeding seasons(Natural Resource Technical Report NPS/SFAN/NRTR—2012/649). National Park Service Department of Interior.
4. COLONIZATION BY NORTHERN ELEPHANT SEALS OF THE POINT REYES PENINSULA, CALIFORNIA
5. Allo-suckling occurrence and its effect on lactation and nursing duration in harbour seals (Phoca vitulina) in Orkney, Scotland