Bibliography problem: reference not printed

Question

I rather new to bibliography.bib (bibtex) and I have a weird problem. My problem is that some items the bib files are printed and some not. I added part of the main file and part of the bibtex file below. The first bibfile item is printed while the second is not. I have used \cite{reference name} for both the items. My question is can some help me with fixing this problem?

%%%%Main Tex File%%%%
\bibliographystyle{unsrt} 
\nocite{*}
\bibliography{12_Bibliography/bibdatabase}\addcontentsline{toc}{chapter}{Bibliography}

%%%% Bibtex File%%%%
@Article{inflatblimp2, %this one is printed
author = {Walkenhorst B.T., Miner G.F., Arnold D.V.},
title = {A low cost, radio controlled blimp as a platform for remote sensing},
journal = {Microwave Earth remote sensing laboratory - Brigham Young University},
year  ={2000},
pages = {}
}

@inbook{TOcost5, %this one is not printed
author = {James R. Wertz, Wiley J. Larson},
title = {Space Mission Analysis And Design},
volume = {8},
edition = {Third}, 
pages = {800-801},
    }

Answer 1

With \nocite{*} both entries are typeset, on my system. Look at the log file produced by BibTeX, which has extension .blg for information in case of a missing entry.

By the way, you are specifying author names wrongly:

@Article{inflatblimp2,
author = {Walkenhorst, B.T. and Miner, G.F. and Arnold, D.V.},
title = {A low cost, radio controlled blimp as a platform for remote sensing},
journal = {Microwave Earth remote sensing laboratory - Brigham Young University},
year  ={2000},
}

@inbook{TOcost5,
author = {James R. Wertz and Wiley J. Larson},
title = {Space Mission Analysis And Design},
volume = {8},
edition = {Third}, 
pages = {800-801},
}

The first entry doesn't look like an article, but more like a techical report.