For serious English speaking students I would highly recommend
the new dictionary of the Fryske Akademy..
It's called "Frysk-Ingelsk wurdboek/ Frisian-English Dictionary". The author - Anne Dykstra - has had the help of a great number of native speakers of English who also know Frisian.
It gives many sample sentences with translation for each Frisian word. It's vocabulary is quite modern, so it will assist in all current Frisian texts. It has 1153 pages (16 x 24 cm), 323 of which contain the very practical "English-Frisian wordlist".
All information can be obtained at the site of the Fryske Akademy
A page has been reproduced below