Wilkinson, John, author
Springer, 2012
eBooks
Cavin, Jerry D., author
Springer, 2012
eBooks
Hibberd, James Shirley, author
Groombridge, 1953
Buku Teks
Ilcev, Stojce Dimov, author
Springer Nature, 2019
eBooks
Lofland, John, author
Wadsworth, 1971
Buku Teks