1. Observational study of behaviour: sampling methods;Altmann;Behaviour,1974
2. Ecomorphological relationships of a guild of ground-foraging birds in northern California, USA;Block;Oecologia,1991
3. Cuantificando el comportamiento: estrategias de búsqueda y ecología de forrajeo de 12 especies sintópicas de Atrapamoscas (Tyrannidae) en la Sierra Nevada de Santa Marta, Colombia;Botero-Delgadillo;Revista Brasileira de Ornitologia,2011
4. Influence of sample size on interpretations of foraging patterns by Chestnut-backed Chickadees;Brennan;Studies in Avian Biology,1990
5. Applied Multivariate Statistics in Geohydrology and Related Sciences