Unfortunately, most of the good magazines of the past are now defunct due to the Internet's vast array of information ( not all correct BTW).
I suggest, if you want to get some information on the original fish that have been modified to today's offerings (i.e. A balloon Molly is just a differently shaped regular Molly and NOT a separate specie), you may want to read through some of the older TFH books such as: The handbook of tropical Aquarium fishes by Axelrod and Schultz, Encyclopedia of tropical fish by Innes ( Known in the the industry as "the Innes book" ) as well as the species specific books that were put out by TFH publications back in the 60s and 70s. These books will not have pictures or descriptions of today's varieties but, for example, if you know about a Silver Angelfish, that info goes to Marbles, Golds, Kois, etc. as well. Same with Guppies and Zebra Danios ( Glowfish are just modified zebra danios) and all the other fish. Another example, Berry Tetras, are originally Black Skirt Tetras. They may have gone through many variations to get them to this point but they have the same requirements of Black Skirt tetras.
As for new books being published today, I have seen some of the books available in the shops and I must admit, I do not know of these authors nor do I think they compare to the information I got from the books I mentioned above. (Just my opinion of course.)
I have seen some of these books being offered on Ebay as part of collections being sold so I'd start there for these.
There are, I believe, some foreign magazines that are supposed to be the next generation of quality information. Amazonas Magazine and Practical Fish Keeping magazine seem to be the best offered.
I hope this helps.