H.S. · H. Sick · Sick Helmut
| title | ISBN-13 | year of publication |
|---|---|---|
| Birds in Brazil | 978-0-691-08569-2 | 1993 |
| Ornitologia brasileira | 978-85-209-0816-7 | 1997 |
| Ornitologia Brasileira | 978-85-230-0087-5 | 1984 |
| Tucani | 978-84-480-3505-1 | 1997 |
Princeton University Press · Timun Mas · UNB